Codedom - Enum inside a Class

Question

I am using Codedom to build class automatically. What I want to do is generate below code automatically

public class MyEnums

{

    public enum EnumTypes

   {

    [EnumValueData(Val = "ABCD")]

    ABCD,

   [EnumValueData(Val = "EFGH")]

   EFGH,

   [EnumValueData(Val = "IJKL")]

   IJKL

 }

}

Problem is i can directly generate enum or class, I am not able to get anything where in i can generate Enum inside a class.

Any help on this will be greatly appreciated.

Thanks,
Het

Answer 1

You can use the following code:

CodeCompileUnit ccu = new CodeCompileUnit();

CodeNamespace cns = new CodeNamespace();

ccu.Namespaces.Add(cns);

CodeTypeDeclaration ctdc = new CodeTypeDeclaration("MyEnums");

cns.Types.Add(ctdc);

CodeTypeDeclaration ctde = new CodeTypeDeclaration("EnumTypes");

ctdc.Members.Add(ctde);

ctde.IsEnum = true;

CodeTypeReference evda = new CodeTypeReference(typeof(EnumValueDataAttribute));

CodeMemberField cmf0 = new CodeMemberField();

ctde.Members.Add(cmf0);

cmf0.Name = "ABCD";

cmf0.InitExpression = new CodePrimitiveExpression(0);

cmf0.CustomAttributes.Add(new CodeAttributeDeclaration(evda,

new CodeAttributeArgument("Val", new CodePrimitiveExpression("ABCD"))));

CodeMemberField cmf1 = new CodeMemberField();

ctde.Members.Add(cmf1);

cmf1.Name = "EFGH";

cmf1.InitExpression = new CodePrimitiveExpression(1);

cmf1.CustomAttributes.Add(new CodeAttributeDeclaration(evda,

new CodeAttributeArgument("Val", new CodePrimitiveExpression("EFGH"))));

using (CodeDomProvider provider = new CSharpCodeProvider())

{

CodeGeneratorOptions options = new CodeGeneratorOptions();

using (StringWriter tw = new StringWriter())

{

provider.GenerateCodeFromCompileUnit(ccu, tw, options);

Console.WriteLine(tw.ToString());

}

}

To generate the code:

public class MyEnums {

public enum EnumTypes {

[EnumValueDataAttribute(Val="ABCD")]

ABCD = 0,

[EnumValueDataAttribute(Val="EFGH")]

EFGH = 1,

}

}

Probably the key for you is to realize that the nested type can be added to the MembersCollection (Members property) of the containing CodeTypeDeclaration.

 

Answer 2

Thanks this was very helpful and it worked !, I did few changes though included below 

CodeMemberField cmfEnum = new CodeMemberField();

cmfEnum.Name = "ABCD"; 

CodeAttributeDeclaration codeAttrDecl = new CodeAttributeDeclaration("EnumValueData");

CodeAttributeArgument codeAttriArg = new CodeAttributeArgument("Val", new CodeSnippetExpression("ABCD"));

codeAttrDecl.Arguments.Add(codeAttriArg);

cmfEnum.CustomAttributes.Add(codeAttrDecl);

ctdClass.Members.Add(cmfEnum);