Csvhelper ignore missing column. Here is some code: // Create a reader. Substring(91); using (TextReader sr = new StringReader(dane)) var csv = new CsvReader(sr); csv. ListSeparator. var map = new Optional Maps. static void Main( string[] args ) using( var stream = File. In my CSV i have a column which contains a double value, but the csv generation tool can create this as an empty field. We're parsing a CSV file to then export to a SQL table. Read () function, is there a way to ignore blank records and/or whitespace? I need to return the raw string [] but was hoping, I could do some cleanup functions when parsing with the library. Ignore (); Header is fine, but output data is still showing values of DbId column: https://dotnetfiddle. There are 2 potential errors from CsvHelper - BadDataException which is thrown for the data I show in the question and MissingFieldException for if "Doe", was missing for example. csv")) using (var csv = new CsvReader(reader, CultureInfo. 0 from 2017 which included, according to the change log: 3. MyProperty ). Why do you want to ignore quotes when reading? Quotes around a field in a CSV file are there for escaping text. CsvHelper works by using a standard disposable StreamReader object to open the file, and a disposable CsvReader object to process the stream. IgnoreReadingExceptions = true; csv. Oct 23, 2015 · Tested it to read a CSV file with 11 columns X 31 rows , all cell data were read successfully. BadDataException: You can ignore bad data by setting BadDataFound to null. HasHeaderRecord = true, // Delimiter = ",", This is the default so no need to change. I've checked Github and CsvReader. ReadingExceptionCallback = ( ex, row ) => { // Do something with the exception and row data. CsvHelper discards row if there is a missing field. Share. It's probably recognizing quotes as being strings and just importing the strings. very little code. using (var writer = new StreamWriter(@"file. Thus the following code now just works, and has worked for a while: var csvText = "some crap linesome empty lineCOL1,COL2,COl3val1,val2,val3val1 CsvHelper ライブラリをつかってモデルのプロパティに [Name ()] 属性を付与すると. Most of the configuration done via class maps can also be done using attributes. Data Id,Name 1,one Example void Main() { using (var reader = new StreamReader("path\\to\\file. Read (), because I need to verify all the headers present in CSV File. If you open a file like that in Excel, you won't see the quotes. Hi, I have exported the string table in csv format, and then edited some translations. Name("Patient ID"); CsvHelper. Convert CSV rows into dynamic objects. This is going to change in the future, but for now you need to set it to whatever your file uses. Your answer would remove the first data but not the header. I manually added header to one of these files and with the following code using CSVHelper I can read the files and show them in a GridView. We can then iterate data and access the values in each row. Field3). public long Id { get; set; } public int Semester { get; set; } public int Year { get; set; } This Model works fine for the first type of file. ToList(); CsvHelper creates these dynamic records, setting the field/column name as Field1, Field2 and so forth. Header with name 'name'[0] was not found. Sep 3, 2020 · 1. This is the code I'm using, hope it helps: CsvReader csv = new CsvReader(new StreamReader(file. The CsvConfiguration class has many configurables to control how we read a CSV file. We can read each field manually like: Jan 19, 2021 · slim16165. CsvDataReader reader = CsvDataReader. How do I check in C# for a missing column in a csv file given I use the nuget package sylvan csv reader. Jul 21, 2017 · StefanBertels commented on Jul 21, 2017. (It's the user who also enters the header row and data row, the program should do the rest). with following code (i used substring to get rid of the NOTE section): String dane = e. When I tried doing this the CsvHelper kind of stops where there is an empty field. Configuration; 🎉. '". DefaultTypeConverter". WriteLine(date); } This foreach loop iterates over all elemtens of the current row and print them. When working with C# and CSV files, I always use CSVHelper. You can get a callback when an exception occurs. e. ググッて見ると、RegisterClassMapを使うのではなく、ClassMap使ったりといったものがありましたが、それで Nov 15, 2020 · Field with name 'encryption' does not exist. For example, the value in FirstName column will be mapped into Person. Nov 8, 2021 · 1. please create a new Console app and drop-in the following. Is there any way to skip unwanted columns while reading csv file using CSVHelper. I want to export it back to the original format. I couldn't agree more, it's simply awesome :). Field2). Writing Injection Warning. headerNames and 'headerNameIndex' will respectivlly contains the expect names or index for the header. I am using CSVHelper to import csv data into a table, I noticed that the following string breaks my import and I end up with my data shifted on all fields after the fourth field. Mapping properties that have duplicate header names. Due to this issue, there is a setting InjectionOptions that can be configured. Name("FirstField"); Map(m => m. Latest Version supports this : public sealed MyClassMap : CsvClassMap {public MyClassMap() {AutoMap(); Map( m => m. Missing or incorrect Newline characters when using CsvHelper is a common problem with a simple but poorly documented solution. Hello. ValidationException: 'Header matching ['ID'] names at index 0 was not found. Here is my code: var records = getRecords(); // list of row definition items. I cannot replicate the issue so far. csv. commented on Jan 23, 2018. InvariantCulture) { MissingFieldFound = null }; using Oct 1, 2021 · In my first example, the column "Entity" is present and all the field is present but someone are empty. I am trying to read csv files. Query(sqlProcedure); //dynamic columns. csv"; Mar 25, 2019 · using (var csv = new CsvWriter(writer)) records. If you are expecting some headers to be missing and want to ignore this validation, set the configuration HeaderValidated to null. In this example, create the following class. These are the top rated real world C# (CSharp) examples of CsvHelper. GetRecords (); csvReader. 👍 1. I think it is because there are no fields for Semester and Year in CSV. GetRecords(). Below are "Missing Title at row 5" But this returns only one missing field, so i want to return something like { Title: [3,5,10]} where 3, 5 and 10 are the empty rows in the Title column. First , install CsvHelper 30. net/XP2Vvq. Is there a way to specify that a particular field might be missing, and if it is, then don't throw even if WillThrowOnMissingField = true? Jun 24, 2019 · 0. I have created an object to put these values in with string attribute for all 3. I can read in the csv file, but how do I address each column of data. Is there any way to parse till the end of file to get the kind of response I wanted? Sep 26, 2022 · When your CSV header names don’t match your property names exactly, CsvHelper will throw an exception. Configuring the behavior of CsvHelper to work with your CSV data or custom class structures. RemoveAt(0); // Removes the header row. Jan 25, 2015 · commented on Jan 25, 2015. Result. By using the MissingFieldStrategy and DefaultValue properties, you can easily handle missing fields in a CSV file and ensure that your data is parsed correctly. Read () seems to use SkipEmptyRecords but this doesn Dec 30, 2021 · I have a lot of CSV files without header and need to read it in C#. Thank you! Jun 24, 2014 · @JoshClose may i use this same above thing with the CSVHelper version 2. So I modified my code to add the MissingFieldFound to null and it kicks up the error: The conversion cannot be performed Text:'' MemberType: TypeConverter "CsvHelper. Since there is no way to tell what type the properties should be, all the properties on the dynamic object are strings. I was using a custom CSV processor which allowed me to specify how many lines to skip before starting processing on the file. I don't want all the columns contained in csv. // Replace with your CSV file path. Options can be passed to the type converters. Read more than 1 header row. Then i pass this requiredFields collection into the mapper like so . Header with name 'UnitPrice'[0] was not found. TextInfo. As an another approach, define an XML/JSON config file where you can define the columns you want to map. The csv file is like this: FrameNO, Ttotal, TNo, X, Y, Z , Speed , Intensity, ILog ; Feb 6, 2021 · CsvHelperを22. It's a small library for reading and writing CSV files. first column value is empty. DbId). Using type conversion to convert CSV fields to and from . row[0] = csvReader[0]; // Skip the first column. The full exception is: An exception of type 'CsvHelper. Upgraded to the latest version and I can no longer assign value to properties of IReaderConfiguration and I had the same issue of him. In most cases, the first step is to create a class that corresponds to the elements of the . I have a CSV files that can be structured similar to the following: When using Josh Close's CsvHelper and calling GetRecords<T> as per: The list of data does not contain the second row. I Will never have missing field in this example. Below is my current take on it. Write a parser that could parse your XML/JSON config and return the columns to be mapped dynamically. 2. Most type converters use IFormattable. Especially in the case where a line starts with ',' (comma), i. Convert a field to a type inline. As far as I know the header of a csv file is just the first row. OpenReadStream())); csv. When I try importing that csv file, uUnity gives me this error: MissingFieldException: Field at index '2' does not exist. I moved the property initialization to the constructor but IgnoreQuotes is missing. May 5, 2015 · 13. Apr 24, 2019 · JoshClose commented on Apr 24, 2019. This may have been implemented as far back as Release 3. Read Manually. ' Jan 24, 2018 · 7. CsvParser extracted from open source projects. Jim;1. Context. Ignoring mapped properites. Get Dynamic Records. Attributes. CsvMissingFieldException: 'Fields 'Patient ID' do not exist in the CSV file. Additional information: Fields 'PartNumber' do not exist in the CSV file. InvariantCulture)) { csv. public class Person { public string DisplayName { get; set; } public int Age { get; set; } } I need to write quoted headers, i. csv" ) ) Oct 22, 2022 · CsvHelper Class Mapping. Implied knowledge when using CsvHelper. 00} Due to the commas in the list it is double quoting this in the output, but I am wanting to disable this functionality. Using CsvHelper 6. Example: public class Test. If there is another blank field the next non-blank field will move forward to fill. Mar 15, 2023 · When your CSV header names don’t match your property names exactly, CsvHelper will throw an exception. WriteLine(csv_headers. My csvhelper mapping is in MyCsvClass with Map (m => m. That means column indexes are not correct. TypeConvertion. Jul 27, 2022 · CsvHelper. In my second example, the column "Entity" missing. Map(m => m. Setting a constant value for a property. You can also change the functionality to do something else, like logging the issue. Mapping ("SLDE_FUNKTION" does not exist in the csv): CsvHelper discards row if there is a missing field. Then , use these code to save cells value into . CSVHelper - Read column value into a List property. 調べてみると、ヘッダーの読み込みやマッパーあたりが変わっていたようでした。. Automatic mapping. 234|1. 00,2,$3. {. ToList(). var data = csvReader. When I run my code the first variable contains all 3 columns and the other 2 variables are blank. How can I access the list of expected header? Many properties of ReadingContext context will hold the list of current header. I'd like to delete empty columns from csv file. Jan 3, 2018 · I have a set of files I'm reading. Id,Name,Type 1, "Jake",User MAP Oct 20, 2017 · Interestingly handling a missing field with MissingFieldException seems to function exactly as I would like - the exception is thrown but subsequent rows are still read ok. I'd rather map another value (such as empty string) when a field is missing. The record I'm writing looks like this (though with ~200 numeric fields as required by the integration): Dec 7, 2017 · I am trying to use CsvHelper library to write records (or list<SomeModel>) to CSV, but SomeModel class has some reference types properties that are sometimes null. Feel free to copy to a separate issue. 1. Map(dest => dest. How to configure CsvHelper to skip MissingFieldFound rows in C#. CSV. string filePath = @"C:\Temp\MyRawData. Change reader configuration. Oct 2, 2019 · CSVHelper - ignore blank cells in a row unless they are populated. WriteRecords(records); Hi, thanks for your suggestion. There are two different mappings of the CSV columns to the SQL columns, which depend on the first value of each row of the CSV. ただし以下の制約がある. InputStream)); IEnumerable record = csvReader. Dec 8, 2017 · Writing to CSV without quotes on multi-valued columns. 2にしたら、エラーが起きたので利用方法を変更しました. In a source file I have sometimes hyphens for double fields sometimes. Name,Value,Date. var stream = new MemoryStream(); var writer = new StreamWriter(stream); using (var csv = new CsvWriter(writer)) Oct 6, 2017 · When a field is missing in the CSV file, an exception is thrown. Using CsvHelper with . The csvhelper configuration for header: HasHeaderRecord = false, The files are read as dynamic records, since the amount of columns/types vary. I've tinkered with the settings and tried to implement a double converter that accepts an empty string and Oct 17, 2021 · CsvHelper will automatically map each column to the property with the same name. In my first example, value of empty field is empty ==> its OK On my second example the column "Entity" missing. Currently, the delimiter default is set to CultureInfo. So the question is how to config the setting about quote? Notice the log has a col with no quote. This approach allows you to map any no of columns on fly, without having to recompile your code. CsvHelper. NOTE: All directories are updated daily using information from the previous business day. Why does this happen and/or how can I set "MissingFieldFound" to Oct 12, 2021 · Ultimately you would need to put in a request for Josh to add more data to the ShouldSkipRecord argument so you could check for which fields are required. InvariantCulture)) {. OpenRead( @"C:\Users\Josh\Documents\test. NET types. How can i detect that a header column is used in a CSV file that is not mapped in the class that is used for parsing the file with the . Feb 4, 2020 · @GotBannedSoImadeAnotherAccount if you want the values as an array, why do you convert them back to a string?CsvHelper's documentation is adequate. When reading, if the field has quotes around the outside, they aren't a part of the field, and won't be a part of what the library returns to you, which is expected. Add a Comment. こんな感じ （付録へのリンク）で、CSVを一気にモデルに格納できる. Field1). If you have data that may or may not have a header, you can make the mapping optional. 2 , i need to stick with this version . By default, CsvHelper will follow RFC 4180 and use \r for writing newlines no matter what operating system you are running on. Dec 25, 2018 · CsvHelper. 0\libet40-client\CsvHelper. CsvMissingFieldException' occurred in CsvHelper. InvariantCulture) {. Here is what I am doing: CsvReader csvReader = new CsvReader (new StreamReader (file. Jun 16, 2021 · I am using the CsvHelper library to generate a CSV file from an IEnumerable<Person>, where Person is a basic class. g. ' May 1, 2015 · Thanks James for quick reply. RegisterClassMap<FooMap>(); csv. Configuration. Dec 23, 2019 · I'm using the excellent CsvHelper library (currently v12. CSVHelper - ignore blank cells in a row unless they are populated. 3. 1 , then use the library on your code. BaseStream. FirstName. public List<TaskProdEntity> ParseCSVFile() Jan 1, 2019 · I am using CsvHelper I need to wrap all values with quotes. Jul 31, 2018 · public DataMapper() Map(m => m. However, my concern is around if any delimiter characters are used in rows apart from header and data. I'm using CsvHelper 6. Thus your CsvConfiguration should look like: var config = new CsvConfiguration(CultureInfo. csvhelper import ignores delimiter when double quote is inside a field. MissingFieldException: Field at index '2' does not exist. My file contains 3 columns. Below is a sample of the file I am reading: It also looks like you may just want to put whatever is in the CSV file into a data table using the same headers, but "Blank" instead if it's empty. Jul 30, 2019 · When a header is not missing isValid is false. [Name("test1")] public string Test1 { get; set; } [Name("test2")] public string Test2 { get; set; } Oct 22, 2017 · @TimSchmelter Sorry probably trying to fit too much in the question and not being clear. Mar 11, 2022 · But here is the problem, a lot of the times a column or two will be missing from some csv data files. instead of "DisplayName", the column in the resulting file should be "Display Name". ConvertUsing(m => { return 0; }); // required field. I'm not sure what I am doing wrong. If you don’t want to (or can’t) change the Nov 26, 2019 · 1. This is not a perfect solution because it skips if any of the required fields is empty, but it might work for your needs. ConvertUsing(m => { return 1; }); // required field. 0 in my current project, just tested a use case similar to yours, int field in blank in the csv file, and had no problem. I wrote a type converter to handle this. I can use it to know with header is missing. You could just modify your current code slightly. Feb 4, 2021 · The issue was that if there is a blank data in the row, the next available non-blank data will move to that column to fill the value. If you don’t want to (or can’t) change the Nov 24, 2014 · 8. Mapping properties by header index position. But when there’s no header row, it has to map based on field position. This involved me checking the data collection for any empty values on all rows, if so then i can omit that column completely. I have class with required fields only. CsvHelper can read \r, \r, or without any configuration changes. Aug 2, 2014 · CSVHelper documentation says that CSVHelper will automatically map my class to the CSV file. for( var j = 1; j < csvReader. If I use only optional(). Jan 22, 2024 · CSV have very simple structure if you know separator you can write custom Reader that will handle such cases. When opening a CSV in an external program, a formula in a field could be ran that contains a vulnerability. Oct 4, 2019 · CsvReader to ignore blank column. Jul 15, 2019 · I noticed that my file contains an empty row at the end of the file. So if I were to have two sets of data, the CSV file would print out the header and the second set of data. I am wondering is there a way to print nulls as empty string instead of "null". If you know how many columns table have and the type of each column you can write simple parser the 0 line is contain header maybe lane 1 can contain it too so we start from i=1 or i=2 the separator is ',': Oct 12, 2020 · Thanks @David. For example, if your header name is “title” and your property name is “Title”, it’ll throw an exception like: HeaderValidationException: Header with name ‘Title' [0] was not found. I believe I have to use the Mapping class, but from the documentation I cannot figure it out. I was hoping for something simple like an annotation to the class, but I guess not. Dump(); } } public class Foo { public int Id { get Jul 26, 2021 · CsvHelper. explicit (you still get errors on other missing columns, WillThrowOnMissingField := false, no catch-all) explicit value creation (missing column != empty column, individual values possible) StefanBertels mentioned this issue on Aug 9, 2017. Dec 9, 2020 · I'm reading . Is that possible? Data = is a List using (StreamWriter textWriter = new StreamWriter(path)) { textWriter. New to csvHelper. Trim. I modified your code to make the data 3 columns - the name value is blank (the middle column). I called CsvHelper. ToString to write and TryParse to read. May 11, 2022 · Since the header fields Email and ID are preceded by spaces you may also want to set TrimOptions = TrimOptions. The other answers to this SO question are correct but are missing one important detail. GetRecords<Foo>(). HeaderValidationException: 'Header with name 'id'[0] was not found. var records = sqlCon. Using CsvHelper, I'm trying to handle these lines. Using a specific type converter. Read (); Mar 15, 2022 · "CsvHelper. NET list string object. csv")) using (var csv = new CsvWriter(writer, CultureInfo. Can anyone help? thanks. I am trying to write to a CSV file with the help of CSVHelper, one of the values i am writing that has values like this: {1,$1. CSV Helper, Ignore empty Values. Any option for these methods should be available through configuration. Feb 19, 2019 · values. NET CsvHelper library. Ignore();}} how to achieve the above same thing with the CSVHelper version 2. Aug 14, 2019 · 3. Add(value); Yes, that's how CSVs normally work: quotes act as escaping, not part of the values. IgnoreHeaderWhiteSpace = true; 2. モデルに格納できてしまえば、あとはループでデータベースに Add するだけ. Here's an example: var config = new CsvConfiguration(CultureInfo. Otherwise, all it knows is that you have two columns in the file and expects extra semi-colons. Example content included in code sample. May 10, 2021 · Ignore columns from a dynamic records list I&#39;m using Dapper to Query an SQL procedure to which I don&#39;t know the returned columns. If you want to read or write in a non-standard format, you can change the configuration for NewLine. CurrentCulture. 2-Thanks Jun 23, 2014 · CsvHelper throws CsvMissingFieldException. FieldHeaders. 0. I'm pretty sure it has to do with the 10" (inches symbol) in my data: Examples. If I try to load a csv file and Field2 and Field3 are missing, how can I get a list of the missing fields? I know I can check for the existence Jun 20, 2013 · CsvHelper. CSV Dec 24, 2017 · When writing a CSV file there is a need to quote only specific columns. ID is not first) and I want to specify which column is first, second, etc. Count); Usually you know what the data represents, so if you create a class to hold the imported data, CSVHelper will create typed objects for you and put them in a collection. The text was updated successfully, but these errors were encountered: Jun 8, 2021 · Header with name 'ValidUntil'[0] was not found. The number of rows can be large. Jan 4, 2017 · It seems the CsvHelper library does not support such scenarios because the library simply uses indices in ascending order for defined column mappings ("mapped columns"). Create(file, new CsvDataReaderOptions { ResultSetMode Mar 7, 2018 · However, the output of the columns is in an order I do not like (e. May 31, 2019 · The answer for me, was to pass in a collection of fields/columns to ignore into the mapper. I'm using CsvWriter to write the csv row definition class to stream. 23;20200901. RegisterClassMap<PessoaCSVMap>(); Apr 12, 2019 · I want to read a CSV file that has some optional columns, for that I have defined a class with optional property using "?" but can't make it work. But, if it is really needed to have such output, the "not-used" (reserved) columns can be introduced as follows: Appending to an Existing CSV File Example void Main() { var records = new List<Foo> { new Foo { Id = 1, Name = "one" }, }; // Write to a file. WriteLine(row[0]); Of course, this can fail if the line was empty, so you need to check for that, too. Reading CSV data. You can ignore missing fields by setting MissingFieldFound to null". Example CSV. May 7, 2021 · In runtime, I want to dynamically ignore some of the columns. The first row always contains a header row. You can rate examples to help us improve the quality of examples. 0. 2) for CSV file generation, and I'm trying to add my own custom attributes to specify special formatting directly in the class. You can ignore missing fields by setting MissingFieldFound to null. Sep 19, 2022 · Normally, CsvHelper maps fields to properties by matching column names from the header row to property names. Replace filePath with path to csv file. To configure CsvHelper to skip the rows that have more fields than expected, you can use the Configuration object and set its MissingFieldFound property to null. Aug 5, 2020 · If we have a csv file with lots of columns, one of which is HelloWorld, is there a way to make it so that when CsvHelper parses the file, if the field under the column HelloWorld is empty, instead of returning/writing an empty string, to write something else (for example null, or hello!). The files contain data at the front of which should be skipped. Configuration allows you to choose from one of four available alternatives: CsvHelper ignoring values. reader. " Am I missing something? Sep 8, 2015 · public string A; [FieldOptional, FieldOrder(1), FieldTitle("B")] public string B; [FieldOptional, FieldOrder(2), FieldTitle("C")] public string C; } This way, the runtime knows what the column names are and will parse them accordingly. Aug 4, 2016 · Console. Extremely fast, flexible, and easy to use. using CsvHelper. Configuration Jan 17, 2018 · header_index += 1; csv_headers. It shows how to read strongly typed records, individual fields, anonymous objects, dynamic objects, and even how to load everything into a DataTable through CsvDataReader. . I loaded a csv file in my database with a DbId column not in the file. create a csv file with contents below. public class MyItem { public int Id { get; set; } public int? MyValue { get; set; } } The mapping class: Essentially, CsvHelper parser doesn't work properly if '\r' is a line separator. In that case, the first comma is absorbed into the first row field. Write(p, 0, p. The number of columns is unknown at first, sometimes there are three columns and sometimes there are 30+. dll When i try to import a csv file where a column doesnt exist an exception is thrown. CsvHelper has a mapping configuration which accepts only predefined classes. Mapping properties that may be one of many names. I can also replicate your results and it does work! I won't know the number of columns, it will be dynamic and can change. But in case of second it throws exceptions. If you can't see how to configure CsvHelper to do what you want then you'll probably have to customise it. dll but was not handled in user code. This can be enforced in the config object of the CsvHelper. PatientID). I'm using CsvHelper to parse my CSV files. Replace the loop with this, which will only print the first element (index 0): Console. Add(header_name); Console. Aug 14, 2015 · Hi I'm using csvHelper to read in a csv files with a variable number of columns. public string ConvertToString(object value, IWriterRow row, MemberMapData memberMapData) throw new NotImplementedException(); public object ConvertFromString(string text, IReaderRow row, MemberMapData Jan 22, 2024 · In this article, we have explored how to read a CSV file with missing fields using CsvHelper, and how to set the default value for missing fields to be the last one index. 1. It tries to match field positions to reflected property positions, but it’s not a good idea to rely on this (because there is no guaranteed ordering when using Jan 2, 2020 · I have tried with this code but it doesn't work, it stops in the foreach loop with a runtime exception from CsvHelper "'Field with name 'Y' does not exist. Writing CSV data. csv files without headers. 13. Oct 14, 2015 · It will allow the whole file to still be read, and just ignore the rows that don't work. To tackle this problem one have to make sure that the delimiter character is set correctly. HeaderValidationException: Header with name 'idCentro' was not found. csv file you wish to save, process, or use. John;;20200901. You need to set your delimiter. I&#39;m trying to configure CSVHelper to ignore some of the columns returned by the SQL Procedure, bef Is there way to skip Column from csvHelper. 0, Is there some way to individually configure fields, particually whether they are quoted? Field1,Fie In CsvHelper 2, set the IgnoreHeaderWhiteSpace flag which tells the reader to ignore white space in the headers when matching the columns to the properties by name. " It will work when I remove log's quote (Jake). Sep 22, 2016 · A header can now be read in from any line. Data Identifier||Amount2|IsBool|Constant 1|1,234|1,234|yes|a 2|1. Length; j++ ) {. Using a DataTable to read CSV data. Essentially, CsvHelper parser doesn't work properly if '\r' is a line separator. Read more here: CSV Injection. NET Core 2. The Value field for Jim works fine, but when it reaches John with an empty value i get the below exception. When using the CsvHelper library and in particular the CsvReader. hn bg nn lf yw nw iy er ke rt