|
public static TypeAllowsNullValue ( |
||
| type | ||
| return | bool | |
internal static object ExtractParameterFromDictionary(ParameterInfo parameterInfo, IDictionary <string, object> parameters, MethodInfo methodInfo)
{
object value;
if (!parameters.TryGetValue(parameterInfo.Name, out value))
{
// the key should always be present, even if the parameter value is null
string message = String.Format(CultureInfo.CurrentUICulture, MvcResources.AsyncActionDescriptor_ParameterNotInDictionary,
parameterInfo.Name, parameterInfo.ParameterType, methodInfo, methodInfo.DeclaringType);
throw new ArgumentException(message, "parameters");
}
if (value == null && !TypeHelpers.TypeAllowsNullValue(parameterInfo.ParameterType))
{
// tried to pass a null value for a non-nullable parameter type
string message = String.Format(CultureInfo.CurrentUICulture, MvcResources.AsyncActionDescriptor_ParameterCannotBeNull,
parameterInfo.Name, parameterInfo.ParameterType, methodInfo, methodInfo.DeclaringType);
throw new ArgumentException(message, "parameters");
}
if (value != null && !parameterInfo.ParameterType.IsInstanceOfType(value))
{
// value was supplied but is not of the proper type
string message = String.Format(CultureInfo.CurrentUICulture, MvcResources.AsyncActionDescriptor_ParameterValueHasWrongType,
parameterInfo.Name, methodInfo, methodInfo.DeclaringType, value.GetType(), parameterInfo.ParameterType);
throw new ArgumentException(message, "parameters");
}
return(value);
}
private static object ExtractParameterOrDefaultFromDictionary(ParameterInfo parameterInfo, IDictionary <string, object> parameters)
{
Type parameterType = parameterInfo.ParameterType;
object value;
parameters.TryGetValue(parameterInfo.Name, out value);
// if wrong type, replace with default instance
if (parameterType.IsInstanceOfType(value))
{
return(value);
}
else
{
return((TypeHelpers.TypeAllowsNullValue(parameterType)) ? null : Activator.CreateInstance(parameterType));
}
}