[英]Add Attribute to the property dynamically
以下实现是动态创建类和属性的实现:
public static class MyTypeBuilder
{
public static void CreateNewObject()
{
var myType = CompileResultType();
}
public static Type CompileResultType()
{
TypeBuilder tb = GetTypeBuilder();
ConstructorBuilder constructor = tb.DefineDefaultConstructor(MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName);
var fields = new List<Field>() {
new Field("EmployeeID", typeof(int)),
new Field("EmployeeName", typeof(string)),
new Field("Designation", typeof(string))
};
// NOTE: assuming your list contains Field objects with fields FieldName(string) and FieldType(Type)
foreach (var field in fields)
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);
}
}
在上述相同的实现中,我想为属性添加属性示例
[DelimitedRecord(",")]
[IgnoreEmptyLines()]
private class myDyanmicType
{
[FieldQuoted('"', QuoteMode.OptionalForBoth)]
public int EmployeeID;
[FieldQuoted('"', QuoteMode.OptionalForBoth)]
public String EmployeeName;
[FieldQuoted('"', QuoteMode.OptionalForBoth)]
public String Designation;
}
所以我想像属性添加属性
[FieldQuoted('"', QuoteMode.OptionalForBoth)]
我将如何使用创建动态类和属性的代码来实现此目的
请帮忙。
只是一个更简单,更快捷的方法:将您喜欢的代码编写为字符串,然后在运行时进行编译,一切准备就绪!
string src = "[DelimitedRecord(\",\")] [IgnoreEmptyLines()] private class ...";
var compParms = new CompilerParameters
{
GenerateExecutable = false,
GenerateInMemory = true
};
var csProvider = new CSharpCodeProvider();
CompilerResults compilerResults = csProvider.CompileAssemblyFromSource(compParms, src);
var a = compilerResults.CompiledAssembly; // here you go
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