Question

Title says what i’m trying to do. I can successfully generate an assembly if i don’t specify the LinqOverTypedDatasets option, but i want my typed DataSet to support queries with LINQ.

My code outputs the error:

error CS0006: Metadata file 'System.Data.DataSetExtensions.dll' could not be found

The code:

//System.Data.DataSet myDataSet = << assume myDataSet is valid DataSet object >>;  Dictionary<string, string> options = new Dictionary<string, string>(); options.Add('CompilerVersion', 'v3.5');  using (CSharpCodeProvider cscp = new CSharpCodeProvider(options)) {     CodeNamespace ns = new CodeNamespace('DBSPPS');     CodeCompileUnit ccu = new CodeCompileUnit();      using (StringWriter schemaWriter = new StringWriter())     {         myDataSet.WriteXmlSchema(schemaWriter);         TypedDataSetGenerator.Generate(schemaWriter.ToString(),             ccu,             ns,             cscp,             TypedDataSetGenerator.GenerateOption.LinqOverTypedDatasets             );     }      StringWriter codeWriter = new StringWriter();      cscp.GenerateCodeFromNamespace(ns, codeWriter, new CodeGeneratorOptions());      CompilerParameters parameters = new CompilerParameters();     parameters.GenerateExecutable = false;     parameters.OutputAssembly = 'DBSPPS.dll';     parameters.ReferencedAssemblies.Add('System.dll');     parameters.ReferencedAssemblies.Add('System.Data.dll');     parameters.ReferencedAssemblies.Add('System.Xml.dll');     parameters.ReferencedAssemblies.Add('System.Data.DataSetExtensions.dll');      CompilerResults cr = cscp.CompileAssemblyFromSource(parameters,new string[]{ codeWriter.ToString() });      foreach (string msg in cr.Output)         Console.WriteLine(msg); } 

EDIT: figured this out, corrected code appears above! 🙂 The MSDN documentation is WRONG when it describes the setting the compiler version to 3.5. The value for CompilerVersion should be ‘v3.5’ NOT ‘3.5’ as the docs say.

I got the same compilation errors when i didn’t reference required assembiles (System.dll, etc), which was fixed by adding them to the ReferencedAssemblies collection of the CompilerParameters object. However, when i received the error message about System.Data.DataSetExtensions.dll, adding that assembly to the ReferencedAssemblies still resulted in the same error.

I noticed that System.Data.DataSetExtensions.dll isn’t in the location i expected it to be (\WINDOWS\Microsoft.NET\Framework\v3.5), but in \Program Files\Reference Assemblies\Microsoft\Framework\v3.5. I tried specifying the full path, that didn’t work either. I assumed that since the full path wasn’t specified for the other referenced assemblies, it found them in the GAC. Is this not the case for System.Data.DataSetExtensions.dll ? Or is there something else going on?

Thanks for your help.

Answer 1

Try tweaking the config so it knows about 3.5 – see the config example here.