private static MethodMap DetermineBestMatch(IEnumerable <MethodBase> methods, bool mustUseAllParameters,
string[] paramNames, Type[] parameterTypes, object[] sampleParamValues)
{
MethodMap bestMap = null;
foreach (MethodBase method in methods)
{
MethodMap map = CreateMap(method, paramNames, parameterTypes, sampleParamValues, mustUseAllParameters);
if (map != null && map.IsValid)
{
bool isBetter = bestMap == null;
isBetter |= map.IsPerfectMatch;
isBetter |= bestMap != null &&
(map.Cost < bestMap.Cost ||
(map.Cost == bestMap.Cost && map.RequiredParameterCount > bestMap.RequiredParameterCount));
isBetter &= map.IsValid;
if (isBetter)
{
bestMap = map;
}
}
}
if (bestMap != null)
{
bestMap.InitializeInvoker();
return(bestMap);
}
return(null);
}
public static MethodMap PrepareInvoke(Type type, string[] paramNames, Type[] parameterTypes,
object[] sampleParamValues)
{
SourceInfo sourceInfo = new SourceInfo(type, paramNames, parameterTypes);
MethodMap map = ctorMapCache.Get(sourceInfo);
if (map == null)
{
map = DetermineBestConstructorMatch(type, paramNames, parameterTypes, sampleParamValues);
ctorMapCache.Insert(sourceInfo, map);
}
return(map);
}
/// <summary>
/// Creates an instance of the given <paramref name="type"/> using the public properties of the
/// supplied <paramref name="sample"/> object as input.
/// This method will try to determine the least-cost route to constructing the instance, which
/// implies mapping as many properties as possible to constructor parameters. Remaining properties
/// on the source are mapped to properties on the created instance or ignored if none matches.
/// TryCreateInstance is very liberal and attempts to convert values that are not otherwise
/// considered compatible, such as between strings and enums or numbers, Guids and byte[], etc.
/// </summary>
/// <returns>An instance of <paramref name="type"/>.</returns>
public static object TryCreateInstance(this Type type, object sample)
{
Type sourceType = sample.GetType();
SourceInfo sourceInfo = sourceInfoCache.Get(sourceType);
if (sourceInfo == null)
{
sourceInfo = new SourceInfo(sourceType);
sourceInfoCache.Insert(sourceType, sourceInfo);
}
object[] paramValues = sourceInfo.GetParameterValues(sample);
MethodMap map = MapFactory.PrepareInvoke(type, sourceInfo.ParamNames, sourceInfo.ParamTypes, paramValues);
return(map.Invoke(paramValues));
}
/// <summary>
/// Creates an instance of the given <paramref name="type"/> using the supplied parameter information as input.
/// This method will try to determine the least-cost route to constructing the instance, which
/// implies mapping as many properties as possible to constructor parameters. Remaining properties
/// on the source are mapped to properties on the created instance or ignored if none matches.
/// TryCreateInstance is very liberal and attempts to convert values that are not otherwise
/// considered compatible, such as between strings and enums or numbers, Guids and byte[], etc.
/// </summary>
/// <param name="type">The type of which an instance should be created.</param>
/// <param name="parameterNames">The names of the supplied parameters.</param>
/// <param name="parameterTypes">The types of the supplied parameters.</param>
/// <param name="parameterValues">The values of the supplied parameters.</param>
/// <returns>An instance of <paramref name="type"/>.</returns>
public static object TryCreateInstance(this Type type, string[] parameterNames, Type[] parameterTypes,
object[] parameterValues)
{
var names = parameterNames ?? new string[0];
var types = parameterTypes ?? new Type[0];
var values = parameterValues ?? new object[0];
if (names.Length != values.Length || names.Length != types.Length)
{
throw new ArgumentException("Mismatching name, type and value arrays (must be of identical length).");
}
MethodMap map = MapFactory.PrepareInvoke(type, names, types, values);
return(map.Invoke(values));
}
internal static MethodMap DetermineBestConstructorMatch(Type type, string[] paramNames, Type[] parameterTypes,
object[] sampleParamValues)
{
MethodMap map = DetermineBestMatch(type.GetConstructors(), false, paramNames, parameterTypes, sampleParamValues);
if (map != null)
{
return(map);
}
StringBuilder sb = new StringBuilder();
sb.AppendFormat("No constructor found for type {0} using parameters:{1}", type.Name, Environment.NewLine);
sb.AppendFormat("{0}{1}", string.Join(", ", Enumerable.Range(0, paramNames.Length).Select(i => string.Format("{0}:{1}", paramNames[i], parameterTypes[i])).ToArray()), Environment.NewLine);
throw new MissingMethodException(sb.ToString());
}
internal static MethodMap DetermineBestMethodMatch(IEnumerable <MethodBase> methods, bool mustUseAllParameters, string[] paramNames,
Type[] parameterTypes, object[] sampleParamValues)
{
MethodMap map = DetermineBestMatch(methods, mustUseAllParameters, paramNames, parameterTypes, sampleParamValues);
if (map != null)
{
return(map);
}
StringBuilder sb = new StringBuilder();
sb.AppendFormat("No method found ({0} candidates examined) matching the parameters:{1}", methods.ToList().Count, Environment.NewLine);
//sb.AppendFormat("{0}{1}", Format(parameters, "=", ", "), Environment.NewLine);
sb.AppendFormat("{0}{1}", string.Join(", ", Enumerable.Range(0, paramNames.Length).Select(i => string.Format("{0}:{1}", paramNames[i], parameterTypes[i])).ToArray()), Environment.NewLine);
throw new MissingMethodException(sb.ToString());
}
/// <summary>
/// Obtains a list of all methods with the given <paramref name="methodName"/> on the given
/// <paramref name="obj" />, and invokes the best match for the supplied parameters.
/// TryCallMethod is very liberal and attempts to convert values that are not otherwise
/// considered compatible, such as between strings and enums or numbers, Guids and byte[16], etc.
/// </summary>
/// <param name="obj">The type of which an instance should be created.</param>
/// <param name="methodName">The name of the overloaded methods.</param>
/// <param name="mustUseAllParameters">Specifies whether all supplied parameters must be used in the
/// invocation. Unless you know what you are doing you should pass true for this parameter.</param>
/// <param name="parameterNames">The names of the supplied parameters.</param>
/// <param name="parameterTypes">The types of the supplied parameters.</param>
/// <param name="parameterValues">The values of the supplied parameters.</param>
/// <returns>The result of the invocation.</returns>
public static object TryCallMethod(this object obj, string methodName, bool mustUseAllParameters,
string[] parameterNames, Type[] parameterTypes, object[] parameterValues)
{
bool isStatic = obj is Type;
var type = isStatic ? obj as Type : obj.GetType();
var names = parameterNames ?? new string[0];
var types = parameterTypes ?? new Type[0];
var values = parameterValues ?? new object[0];
if (names.Length != values.Length || names.Length != types.Length)
{
throw new ArgumentException("Mismatching name, type and value arrays (must be of identical length).");
}
MethodMap map = MapFactory.DetermineBestMethodMatch(type.Methods(methodName).Cast <MethodBase>(), mustUseAllParameters, names, types, values);
return(isStatic ? map.Invoke(values) : map.Invoke(obj, values));
}