public static Expression BuildConversionCall(this IExpressionGenerator gen, MethodInfo method, Type resultType, params Expression[] inputExpressions)
{
Contract.Requires(gen != null);
Contract.Requires(method != null);
Contract.Requires(inputExpressions != null);
Contract.Requires(Contract.ForAll(inputExpressions, x => x != null));
var methodParams = method.GetParameters();
if (methodParams.Length != inputExpressions.Length)
{
throw new ArgumentException(String.Format("{0} input expressions are required.", methodParams.Length));
}
for (int i = 0; i < methodParams.Length; i++)
{
Contract.Assume(methodParams[i] != null);
var paramType = methodParams[i].ParameterType;
var inputExpression = inputExpressions[i];
if (inputExpression.Type != paramType)
{
inputExpressions[i] = gen.GenerateConversionOrThrow(paramType, inputExpression);
}
}
Expression result = method.BuildCallExpression(inputExpressions);
if (resultType != null && result.Type != resultType)
{
result = gen.GenerateConversionOrThrow(resultType, result);
}
return(result);
}
public static Expression BuildConversionCall(this IExpressionGenerator gen, MethodInfo method, Expression input, Type resultType)
{
Contract.Requires(gen != null);
Contract.Requires(method != null);
Contract.Requires(input != null);
var methodParams = method.GetParameters();
if (methodParams.Length > 0)
{
Contract.Assume(methodParams[0] != null);
var paramType = methodParams[0].ParameterType;
if (input.Type != paramType)
{
input = gen.GenerateConversionOrThrow(paramType, input);
}
}
Expression result = method.BuildCallExpression(input);
if (resultType != null && result.Type != resultType)
{
result = gen.GenerateConversionOrThrow(resultType, result);
}
return(result);
}
Action <object, object> CreateAddDelegate(object instance, object item, Type collectionType, Type itemType, Tuple <Type, Type> key, XamlInvokerOptions mode)
{
// this is separate as the anonymous types are instantiated at the beginning of the method
Action <object, object> addDelegate;
MethodInfo mi = LookupAddCollectionMethod(Type, collectionType, itemType);
if (mi == null)
{
throw new InvalidOperationException($"The collection type '{collectionType}' does not have 'Add' method");
}
if (mode.HasFlag(XamlInvokerOptions.DeferCompile))
{
cache[key] = addDelegate = (i, v) => mi.Invoke(i, new object[] { v });
Task.Factory.StartNew(() => cache[key] = addDelegate = mi.BuildCallExpression());
}
else
{
cache[key] = addDelegate = mi.BuildCallExpression();
}
return(addDelegate);
}
