public void Setup ()
{
var fields = new Dictionary<string, object> () {
{ "foo", 1 },
{ "bar", 4.1f },
{ "foobar", "foobar" }
};
record = new DynamicRecord (fields);
}
public static Type CreateType(string name, DynamicRecord record)
{
// create a dynamic assembly and module
var assemblyName = new AssemblyName("tmpAssembly");
var assemblyBuilder = Thread.GetDomain().DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
var module = assemblyBuilder.DefineDynamicModule("tmpModule");
// create a new type builder
var typeBuilder = module.DefineType(name, TypeAttributes.Public | TypeAttributes.Class);
foreach (var column in record.Columns)
{
var propertyName = column;
var propertyType = record[column].GetType();
var field = typeBuilder.DefineField("_" + propertyName, typeof(string), FieldAttributes.Private);
var property = typeBuilder.DefineProperty(propertyName,
PropertyAttributes.None,
typeof(string),
new[] { propertyType });
var currGetPropMthdBldr = typeBuilder.DefineMethod("get_value",
GetSetAttr,
propertyType,
Type.EmptyTypes);
// Intermediate Language stuff...
var currGetIl = currGetPropMthdBldr.GetILGenerator();
currGetIl.Emit(OpCodes.Ldarg_0);
currGetIl.Emit(OpCodes.Ldfld, field);
currGetIl.Emit(OpCodes.Ret);
// Define the "set" accessor method for current private field.
MethodBuilder currSetPropMthdBldr =
typeBuilder.DefineMethod("set_value",
GetSetAttr,
null,
new[] { propertyType });
// Again some Intermediate Language stuff...
var currSetIL = currSetPropMthdBldr.GetILGenerator();
currSetIL.Emit(OpCodes.Ldarg_0);
currSetIL.Emit(OpCodes.Ldarg_1);
currSetIL.Emit(OpCodes.Stfld, field);
currSetIL.Emit(OpCodes.Ret);
// Last, we must map the two methods created above to our PropertyBuilder to
// their corresponding behaviors, "get" and "set" respectively.
property.SetGetMethod(currGetPropMthdBldr);
property.SetSetMethod(currSetPropMthdBldr);
}
return typeBuilder.CreateType();
}
public static object Cast(DynamicRecord record, Type type)
{
// Now we have our type. Let's create an instance from it:
var generetedObject = Activator.CreateInstance(type);
// Loop over all the generated properties, and assign the values from our XML:
var properties = type.GetProperties();
var propertiesCounter = 0;
// Loop over the values that we will assign to the properties
foreach (var column in record.Columns)
{
var value = record[column];
properties[propertiesCounter].SetValue(generetedObject, value, null);
propertiesCounter++;
}
//Yoopy ! Return our new genereted object.
return generetedObject;
}
