GetMethodCallExpression
(
this MethodInfo methodInfo,
object obj = null,
params IParamValGetterExpressionInfo[] paramValGetterExpressionInfos
)
{
if (methodInfo == null)
{
return(null, null);
}
Expression GetParamExpression(string paramName, Type paramType)
{
IParamValGetterExpressionInfo paramValGetterExpressionInfo =
paramValGetterExpressionInfos
.FirstOrDefault
(
paramValExpressionInfo =>
paramValExpressionInfo.ParamName == paramName);
if (paramValGetterExpressionInfo == null)
{
return(Expression.Parameter(paramType, paramName));
}
else
{
Expression resultExpression =
Expression.Convert(paramValGetterExpressionInfo.ValueGetterExpression, paramType);
return(resultExpression);
}
}
// obtains the expressions for the MethodInfo parameters including the expressions
// to be passed from the Wrapper Method - they are of type ParameterExpression and
// the expressions to obtain the value via IParamValGetterExpressionInfo.ValueGetterExpression
// and conversion (of type UnaryExpression)
Expression[] paramExpressions =
methodInfo.GetParameters()
.Select(paramInfo => GetParamExpression(paramInfo.Name, paramInfo.ParameterType))
.ToArray();
Expression instanceExpr =
obj != null?Expression.Constant(obj) : null;
MethodCallExpression methodCallExpression =
Expression.Call(instanceExpr, methodInfo, paramExpressions);
return(methodCallExpression, paramExpressions.OfType <ParameterExpression>().ToArray());
}
GetMethodCallForOriginalMethodFromTakingObjArgs
(
this MethodInfo methodInfoForMethodAcceptingObjArray,
IEnumerable <ParamInfo> paramInfos,
object obj = null,
params IParamValGetterExpressionInfo[] paramValGetterExpressionInfos)
{
Expression GetParamExpression(string paramName, Type paramType)
{
IParamValGetterExpressionInfo paramValGetterExpressionInfo =
paramValGetterExpressionInfos
.FirstOrDefault
(
paramValExpressionInfo =>
paramValExpressionInfo.ParamName == paramName);
if (paramValGetterExpressionInfo == null)
{
return(Expression.Parameter(paramType, paramName));
}
else
{
return(paramValGetterExpressionInfo.ValueGetterExpression);
}
}
Expression[] parameterExpressions =
paramInfos
?.Select(paramInfo => GetParamExpression(paramInfo.ParamName, paramInfo.ParamType))
?.ToArray();
Expression[] objExpressions =
parameterExpressions
?.Select(paramExpr => Expression.Convert(paramExpr, typeof(object)))
?.ToArray();
MethodCallExpression methodCallExpression = null;
if (obj == null)
{
methodCallExpression = objExpressions != null?
Expression.Call
(
methodInfoForMethodAcceptingObjArray,
Expression.NewArrayInit(typeof(object), objExpressions))
:
Expression.Call(methodInfoForMethodAcceptingObjArray);
}
else
{
methodCallExpression = objExpressions != null?
Expression.Call
(
Expression.Constant(obj),
methodInfoForMethodAcceptingObjArray,
Expression.NewArrayInit(typeof(object), objExpressions))
:
Expression.Call
(
Expression.Constant(obj),
methodInfoForMethodAcceptingObjArray);
}
return(methodCallExpression, parameterExpressions?.OfType <ParameterExpression>()?.ToArray());
}
