System.CodeDom.Tests.CSharpCodeGenerationTests.GenericTypesAndConstraints C# (CSharp) Method

        public void GenericTypesAndConstraints()
        {
            CodeNamespace ns = new CodeNamespace("NS");
            ns.Imports.Add(new CodeNamespaceImport("System"));
            ns.Imports.Add(new CodeNamespaceImport("System.Collections.Generic"));

            CodeTypeDeclaration class1 = new CodeTypeDeclaration();
            class1.Name = "MyDictionary";
            class1.BaseTypes.Add(new CodeTypeReference("Dictionary", new CodeTypeReference[] { new CodeTypeReference("TKey"), new CodeTypeReference("TValue"), }));
            CodeTypeParameter kType = new CodeTypeParameter("TKey");
            kType.HasConstructorConstraint = true;
            kType.Constraints.Add(new CodeTypeReference(typeof(IComparable)));
            kType.CustomAttributes.Add(new CodeAttributeDeclaration(
                "System.ComponentModel.DescriptionAttribute", new CodeAttributeArgument(new CodePrimitiveExpression("KeyType"))));

            CodeTypeReference iComparableT = new CodeTypeReference("IComparable");
            iComparableT.TypeArguments.Add(new CodeTypeReference(kType));
            kType.Constraints.Add(iComparableT);

            CodeTypeParameter vType = new CodeTypeParameter("TValue");
            vType.Constraints.Add(new CodeTypeReference(typeof(IList<System.String>)));
            vType.CustomAttributes.Add(new CodeAttributeDeclaration(
                "System.ComponentModel.DescriptionAttribute", new CodeAttributeArgument(new CodePrimitiveExpression("ValueType"))));

            class1.TypeParameters.Add(kType);
            class1.TypeParameters.Add(vType);
            ns.Types.Add(class1);

            // Declare a generic method.
            CodeMemberMethod printMethod = new CodeMemberMethod();
            CodeTypeParameter sType = new CodeTypeParameter("S");
            sType.HasConstructorConstraint = true;
            CodeTypeParameter tType = new CodeTypeParameter("T");
            sType.HasConstructorConstraint = true;

            printMethod.Name = "Nop";
            printMethod.TypeParameters.Add(sType);
            printMethod.TypeParameters.Add(tType);
            printMethod.Attributes = MemberAttributes.Public;
            class1.Members.Add(printMethod);

            var class2 = new CodeTypeDeclaration();
            class2.Name = "Demo";

            var methodMain = new CodeEntryPointMethod();
            var myClass = new CodeTypeReference(
                "MyDictionary",
                new CodeTypeReference[] {
                    new CodeTypeReference(typeof(int)),
                    new CodeTypeReference("List",
                       new CodeTypeReference[]
                            {new CodeTypeReference("System.String") })});
            methodMain.Statements.Add(new CodeVariableDeclarationStatement(myClass, "dict", new CodeObjectCreateExpression(myClass)));
            string dictionaryTypeName = typeof(System.Collections.Generic.Dictionary<int, System.Collections.Generic.List<string>>[]).FullName;

            var dictionaryType = new CodeTypeReference(dictionaryTypeName);
            methodMain.Statements.Add(
                  new CodeVariableDeclarationStatement(dictionaryType, "dict2",
                     new CodeArrayCreateExpression(dictionaryType, new CodeExpression[1] { new CodePrimitiveExpression(null) })));

            class2.Members.Add(methodMain);
            ns.Types.Add(class2);

            AssertEqual(ns,
                @"namespace NS {
                      using System;
                      using System.Collections.Generic;
                      public class MyDictionary<[System.ComponentModel.DescriptionAttribute(""KeyType"")] TKey, [System.ComponentModel.DescriptionAttribute(""ValueType"")]  TValue> : Dictionary<TKey, TValue>
                          where TKey : System.IComparable, IComparable<TKey>, new ()
                          where TValue : System.Collections.Generic.IList<string>
                      {
                          public virtual void Nop<S, T>() where S : new() { }
                      }

                      public class Demo
                      {
                          public static void Main()
                          {
                              MyDictionary<int, List<string>> dict = new MyDictionary<int, List<string>>();
                              System.Collections.Generic.Dictionary<int, System.Collections.Generic.List<string>>[] dict2 = new System.Collections.Generic.Dictionary<int, System.Collections.Generic.List<string>>[] { null};
                          }
                      }
                  }");
        }
    }