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POc# struct fields are "never assigned to" warnings
 

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    <p>Based on <a href="http://alexreg.wordpress.com/2009/05/03/strongly-typed-csv-reader-in-c/" rel="nofollow noreferrer">http://alexreg.wordpress.com/2009/05/03/strongly-typed-csv-reader-in-c/</a>, I created a DLL which can read different file types. I also have unit tests that run successfully. I create a struct and use it as the generic type.</p> <p>Anyway, when I compile, I get a warning on each of the struct fields. For example: field 'FileReader.Tests.CsvReader.Record.Field1' is never assigned to, and will always have its default value 0</p> <p>I am in fact setting the value with SetValueDirect() and when I run through the tests or debug the code, I can verify that. Why is it giving me that error then, and how can I avoid or fix it?</p> <p>Here is some basic code to give you an idea. I'm guessing I haven't provided enough, but hopefully someone has a clue.</p> <pre><code>public abstract class FileReader&lt;TRecord&gt; : IDisposable where TRecord : struct { public TRecord? ReadRecord() { List&lt;string&gt; fields; string rawData; this.recordNumber++; while (this.ReadRecord(this.fieldTypeInfoList.Length, out fields, out rawData)) { try { // Insert the current record number to the beginning of the field list fields.Insert(0, this.recordNumber.ToString(CultureInfo.InvariantCulture)); // Convert each field to its correct type and set the value TRecord record = new TRecord(); FieldTypeInfo fieldTypeInfo; object fieldValue; // Loop through each field for (int i = 0; i &lt; this.fieldTypeInfoList.Length; i++) { fieldTypeInfo = this.fieldTypeInfoList[i]; bool allowNull = fieldTypeInfo.AllowNull == null ? this.AllowNull : fieldTypeInfo.AllowNull.Value; if (i &gt;= fields.Count &amp;&amp; !allowNull) { // There are no field values for the current field throw new ParseException("Field is missing", this.RecordNumber, fieldTypeInfo, rawData); } else { // Trim the field value bool trimSpaces = fieldTypeInfo.TrimSpaces == null ? this.TrimSpaces : fieldTypeInfo.TrimSpaces.Value; if (trimSpaces) { fields[i] = fields[i].Trim(); } if (fields[i].Length == 0 &amp;&amp; !allowNull) { throw new ParseException("Field is null", this.RecordNumber, fieldTypeInfo, rawData); } try { fieldValue = fieldTypeInfo.TypeConverter.ConvertFromString(fields[i]); } catch (Exception ex) { throw new ParseException("Could not convert field value", ex, this.RecordNumber, fieldTypeInfo, rawData); } fieldTypeInfo.FieldInfo.SetValueDirect(__makeref(record), fieldValue); } } return record; } catch (ParseException ex) { ParseErrorAction action = (ex.FieldTypeInfo.ParseError == null) ? DefaultParseErrorAction : ex.FieldTypeInfo.ParseError.Value; switch (action) { case ParseErrorAction.SkipRecord: continue; case ParseErrorAction.ThrowException: throw; case ParseErrorAction.RaiseEvent: throw new NotImplementedException("Events are not yet available", ex); default: throw new NotImplementedException("Unknown ParseErrorAction", ex); } } } return null; } } </code></pre>
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    1. USNelson Rothermel
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    1. COIt might have been easier to simplify your example...
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      1. USMarc Gravell
    2. COI started doing that, but then it seemed overly simplified. The important part I suppose is: fieldTypeInfo.FieldInfo.SetValueDirect(__makeref(record), fieldValue);
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    3. COThe point is: without the simpler example we can't reproduce what you are seeing... so a bit hard to answer with confidence.
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