我有一堂课,看起来像这样:
public class Field { public string FieldName; public string FieldType; }
还有一个List<Field>带有值的对象:
List<Field>
{"EmployeeID","int"}, {"EmployeeName","String"}, {"Designation","String"}
我想创建一个看起来像这样的类:
Class DynamicClass { int EmployeeID, String EmployeeName, String Designation }
有什么办法吗?
我希望这在运行时生成。我不希望文件系统中存在物理CS文件。
是的,您可以System.Reflection.Emit为此使用命名空间。如果您没有经验,这不是直截了当的,但肯定是可能的。
System.Reflection.Emit
编辑: 此代码可能有缺陷,但是它将为您提供总体思路,并有望为实现该目标提供良好的开端。
using System; using System.Reflection; using System.Reflection.Emit; namespace TypeBuilderNamespace { public static class MyTypeBuilder { public static void CreateNewObject() { var myType = CompileResultType(); var myObject = Activator.CreateInstance(myType); } public static Type CompileResultType() { TypeBuilder tb = GetTypeBuilder(); ConstructorBuilder constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName); // NOTE: assuming your list contains Field objects with fields FieldName(string) and FieldType(Type) foreach (var field in yourListOfFields) CreateProperty(tb, field.FieldName, field.FieldType); Type objectType = tb.CreateType(); return objectType; } private static TypeBuilder GetTypeBuilder() { var typeSignature = "MyDynamicType"; var an = new AssemblyName(typeSignature); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(an, AssemblyBuilderAccess.Run); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MainModule"); TypeBuilder tb = moduleBuilder.DefineType(typeSignature, TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.AutoClass | TypeAttributes.AnsiClass | TypeAttributes.BeforeFieldInit | TypeAttributes.AutoLayout, null); return tb; } private static void CreateProperty(TypeBuilder tb, string propertyName, Type propertyType) { FieldBuilder fieldBuilder = tb.DefineField("_" + propertyName, propertyType, FieldAttributes.Private); PropertyBuilder propertyBuilder = tb.DefineProperty(propertyName, PropertyAttributes.HasDefault, propertyType, null); MethodBuilder getPropMthdBldr = tb.DefineMethod("get_" + propertyName, MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig, propertyType, Type.EmptyTypes); ILGenerator getIl = getPropMthdBldr.GetILGenerator(); getIl.Emit(OpCodes.Ldarg_0); getIl.Emit(OpCodes.Ldfld, fieldBuilder); getIl.Emit(OpCodes.Ret); MethodBuilder setPropMthdBldr = tb.DefineMethod("set_" + propertyName, MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig, null, new[] { propertyType }); ILGenerator setIl = setPropMthdBldr.GetILGenerator(); Label modifyProperty = setIl.DefineLabel(); Label exitSet = setIl.DefineLabel(); setIl.MarkLabel(modifyProperty); setIl.Emit(OpCodes.Ldarg_0); setIl.Emit(OpCodes.Ldarg_1); setIl.Emit(OpCodes.Stfld, fieldBuilder); setIl.Emit(OpCodes.Nop); setIl.MarkLabel(exitSet); setIl.Emit(OpCodes.Ret); propertyBuilder.SetGetMethod(getPropMthdBldr); propertyBuilder.SetSetMethod(setPropMthdBldr); } } }