public Action <T, T> CopyAction <T>()
{
var key = typeof(T).FullName;
if (_actions.TryGetValue(key, out var action))
{
return(action as Action <T, T>);
}
var className = CopyProviderHelper.GetClassName(typeof(T), typeof(T));
var flags = BindingFlags.Public | BindingFlags.Static |
BindingFlags.InvokeMethod;
if (!_comp.TryGetValue(className, out var comp))
{
comp = GenerateCopyClass(typeof(T), typeof(T));
}
// comp = GenerateCopyClass(typeof(T), typeof(TU));
var result = comp.InvokeMember("CopyAction", flags, null,
null, null) as Action <T, T>;
_actions.Add(key, result);
return(result);
}
/// <summary>
/// Creates the copy method.
/// </summary>
/// <param name="sourceType">Type of the source.</param>
/// <param name="targetType">Type of the target.</param>
/// <returns></returns>
private static CodeMemberMethod CreateCopyMethod(Type sourceType, Type targetType)
{
var copyMethod = new CodeMemberMethod
{
Attributes = MemberAttributes.Public | MemberAttributes.Static,
Name = CopyMethodName
};
var source = new CodeParameterDeclarationExpression(sourceType, "source");
var target = new CodeParameterDeclarationExpression(targetType, "target");
copyMethod.Parameters.Add(source);
copyMethod.Parameters.Add(target);
var map = CopyProviderHelper.GetMatchingProperties(sourceType, targetType);
foreach (var item in map)
{
var targetReference =
new CodeFieldReferenceExpression(new CodeVariableReferenceExpression(target.Name),
item.TargetProperty.Name);
var sourceReference =
new CodeFieldReferenceExpression(new CodeVariableReferenceExpression(source.Name),
item.SourceProperty.Name);
copyMethod.Statements.Add(new CodeAssignStatement(targetReference, sourceReference));
}
return(copyMethod);
}
public void AddPropertyMap <T, TU>()
{
var props = CopyProviderHelper.GetMatchingProperties(typeof(T), typeof(TU));
var className = CopyProviderHelper.GetClassName(typeof(T), typeof(TU));
_maps.Add(className, props.ToArray());
}
public PropertyMap[] AddPropertyMap(object source, object target)
{
var props = CopyProviderHelper.GetMatchingProperties(source.GetType(), target.GetType());
var className = CopyProviderHelper.GetClassName(source.GetType(), target.GetType());
var array = props.ToArray();
_maps.Add(className, array);
return(array);
}
public void Copy <T, TU>(T source, TU target)
{
var className = CopyProviderHelper.GetClassName(source.GetType(), target.GetType());
if (!(_maps.TryGetValue(className, out var propMap)))
{
propMap = AddPropertyMap(source, target);
}
foreach (var prop in propMap)
{
var sourceValue = prop.SourceProperty.GetValue(source, null);
prop.TargetProperty.SetValue(target, sourceValue, null);
}
}
public void CopyWithDom <T, TU>(T source, TU target)
{
var className = CopyProviderHelper.GetClassName(typeof(T), typeof(TU));
var flags = BindingFlags.Public | BindingFlags.Static |
BindingFlags.InvokeMethod;
var args = new object[] { source, target };
if (!_comp.TryGetValue(className, out var comp))
{
comp = GenerateCopyClass(source.GetType(), target.GetType());
}
// comp = GenerateCopyClass(typeof(T), typeof(TU));
comp.InvokeMember("CopyProps", flags, null, null, args);
}
/// <summary>
/// Creates the copy action.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TU">The type of the u.</typeparam>
/// <param name="key">The key.</param>
/// <returns></returns>
private Action <T, TU> CreateCopyAction <T, TU>(string key)
{
var className = CopyProviderHelper.GetClassName(typeof(T), typeof(TU));
const BindingFlags flags = BindingFlags.Public | BindingFlags.Static |
BindingFlags.InvokeMethod;
if (!_comp.TryGetValue(className, out var comp))
{
comp = GenerateCopyClass(typeof(T), typeof(TU));
}
var result = comp.InvokeMember(CopyActionMethodName, flags, null,
null, null) as Action <T, TU>;
_actions.Add(key, result);
return(result);
}
/// <summary>
/// Generates the copy class.
/// </summary>
/// <param name="sourceType">Type of the source.</param>
/// <param name="targetType">Type of the target.</param>
/// <returns></returns>
public Type GenerateCopyClass(Type sourceType, Type targetType)
{
var className = CopyProviderHelper.GetClassName(sourceType, targetType);
if (_comp.TryGetValue(className, out var type))
{
return(type);
}
var unit = new CodeCompileUnit();
var ns = CreateNamespace();
unit.Namespaces.Add(ns);
var targetClass = CreateClass(className);
ns.Types.Add(targetClass);
var copyMethod = CreateCopyMethod(sourceType, targetType);
targetClass.Members.Add(copyMethod);
var copyActionMethod = CreateCopyActionMethod(sourceType, targetType, copyMethod);
targetClass.Members.Add(copyActionMethod);
Debug.WriteLine(unit.ToString());
var results = BuildAssembly(unit, targetType.Assembly);
// Compiler output
foreach (var line in results.Output)
{
Debug.WriteLine(line);
}
var copierType = results.CompiledAssembly.GetType(NamespaceName + "." + className);
_comp.Add(className, copierType);
return(copierType);
}
public Type GenerateCopyClass(Type sourceType, Type targetType)
{
var className = CopyProviderHelper.GetClassName(sourceType, targetType);
if (_comp.TryGetValue(className, out var type))
{
return(type);
}
var builder = new StringBuilder();
builder.Append("namespace CopyHelper {\r\n");
builder.Append(" using System;\r\n");
builder.Append(" public class ");
builder.Append(className);
builder.Append(" {\r\n");
builder.Append(" public static Action<" + sourceType.FullName + ", " + targetType.FullName +
"> CopyAction()");
builder.Append(" {\r\n");
builder.Append(" return CopyProps;");
builder.Append(" }\r\n");
builder.Append(" public static void CopyProps(");
builder.Append(sourceType.FullName);
builder.Append(" source, ");
builder.Append(targetType.FullName);
builder.Append(" target) {\r\n");
var map = CopyProviderHelper.GetMatchingProperties(sourceType, targetType);
foreach (var item in map)
{
builder.Append(" target.");
builder.Append(item.TargetProperty.Name);
builder.Append(" = ");
builder.Append("source.");
builder.Append(item.SourceProperty.Name);
builder.Append(";\r\n");
}
builder.Append(" }\r\n }\r\n}");
// Write out method body
Debug.WriteLine(builder.ToString());
var codeCompiler = CodeDomProvider.CreateProvider("CSharp");
var compilerParameters = new CompilerParameters();
compilerParameters.ReferencedAssemblies.Add(typeof(TestObject).Assembly.Location);
compilerParameters.GenerateInMemory = true;
var results = codeCompiler.CompileAssemblyFromSource(compilerParameters, builder.ToString());
// Compiler output
foreach (var line in results.Output)
{
Debug.WriteLine(line);
}
var copierType = results.CompiledAssembly.GetType("CopyHelper." + className);
_comp.Add(className, copierType);
return(copierType);
}