public static object CreateInstance(Type instanceType, IServiceProvider services, params object[] parameters)
{
if (services == null)
{
return(CreateInstance(instanceType, parameters));
}
if (instanceType == null)
{
throw new ArgumentNullException(nameof(instanceType));
}
CheckInstanceTypeOrThrow(instanceType);
if (instanceType.GetTypeInfo().IsPrimitive)
{
object value;
if (parameters.Length > 0 && TryFindBestMatchOfPrimitive(instanceType, parameters, out value))
{
return(value);
}
throw new InvalidOperationException($"primitive type {instanceType.Name} has no constructor");
}
ConstructorInfo[] constructors = instanceType.GetConstructorsFromCache();
if (constructors.Length <= 0)
{
throw new InvalidOperationException($"cannot find any constructor to initialize instance of type {instanceType.Name}");
}
IEnumerable <ArgumentMatchedResult> matchResults = null;
if (parameters.Length > 0)
{
matchResults = constructors.Select(m => ArgumentMatchedResult.Match(m, services, parameters));
}
else
{
matchResults = constructors.Select(m => ArgumentMatchedResult.Match(m, services));
}
ArgumentMatchedResult matchResult = FindBestMatch(matchResults);
if (matchResult == null)
{
throw new InvalidOperationException($"cannot find any constructor of type {instanceType.Name} that matchs given parameters");
}
ConstructorInfo constructor = matchResult.Method as ConstructorInfo;
try
{
object instance = constructor.Invoke(matchResult.Result);
return(instance);
}
catch (TargetInvocationException ex)
{
ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
throw;
}
}
public static MethodInvokeContext CreateInvokeContext(MethodInfo method, IReadOnlyDictionary <string, object> options, params object[] parameters)
{
if (method == null)
{
throw new ArgumentNullException(nameof(method));
}
if (options == null)
{
return(CreateInvokeContext(method, parameters));
}
ArgumentMatchedResult matchResult = null;
if (parameters.Length > 0)
{
matchResult = ArgumentMatchedResult.Match(method, options, parameters);
}
else
{
matchResult = ArgumentMatchedResult.Match(method, options);
}
if (!matchResult.IsPassed)
{
return(null);
}
return(new MethodInvokeContext(matchResult.Score, matchResult.Result, method));
}
public static MethodInvokeContext CreateInvokeContext(MethodInfo method, IServiceProvider services, params object[] parameters)
{
if (method == null)
{
throw new ArgumentNullException(nameof(method));
}
if (services == null)
{
return(CreateInvokeContext(method, parameters));
}
ArgumentMatchedResult matchResult = null;
if (parameters.Length > 0)
{
matchResult = ArgumentMatchedResult.Match(method, services, parameters);
}
else
{
matchResult = ArgumentMatchedResult.Match(method, services);
}
if (!matchResult.IsPassed)
{
return(null);
}
return(new MethodInvokeContext(matchResult.Score, matchResult.Result, method));
}
public static object InvokeMethod(object instance, string methodName, IServiceProvider services, IReadOnlyDictionary <string, object> options, params object[] parameters)
{
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
if (methodName == null)
{
throw new ArgumentNullException(nameof(methodName));
}
if (options == null)
{
return(InvokeMethod(instance, methodName, services, parameters));
}
if (services == null)
{
return(InvokeMethod(instance, methodName, options, parameters));
}
Type instanceType = instance.GetType();
MethodInfo[] methods = instanceType.GetMethodOverloads(methodName, false);
if (methods.Length <= 0)
{
throw new InvalidOperationException("cannot find method {methodName} of instance {instance}");
}
IEnumerable <ArgumentMatchedResult> matchResults = null;
if (parameters.Length > 0)
{
matchResults = methods.Select(m => ArgumentMatchedResult.Match(m, services, options, parameters));
}
else
{
matchResults = methods.Select(m => ArgumentMatchedResult.Match(m, services, options));
}
ArgumentMatchedResult matchResult = FindBestMatch(matchResults);
if (matchResult == null)
{
throw new InvalidOperationException($"cannot find any method {methods[0].Name} of instance {instance} that matchs given parameters");
}
InvokeMethodResult result = TryInvokeMethod(instance, matchResult);
if (result.IsExecutionSucceeded == false)
{
throw result.Exception;
}
if (result.HasReturnValueBySignature == false)
{
return(null);
}
else
{
return(result.ReturnValue);
}
}
public static object InvokeMethod(object instance, MethodInfo method, IServiceProvider services, IReadOnlyDictionary <string, object> options, params object[] parameters)
{
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
if (method == null)
{
throw new ArgumentNullException(nameof(method));
}
if (options == null)
{
return(InvokeMethod(instance, method, services, parameters));
}
if (services == null)
{
return(InvokeMethod(instance, method, options, parameters));
}
ArgumentMatchedResult matchResult = null;
if (parameters.Length > 0)
{
matchResult = ArgumentMatchedResult.Match(method, services, options, parameters);
}
else
{
matchResult = ArgumentMatchedResult.Match(method, services, options);
}
InvokeMethodResult result = TryInvokeMethod(instance, matchResult);
if (result.IsExecuted == false)
{
throw new InvalidOperationException("cannot invoke method due to insufficient parameters");
}
if (result.IsExecutionSucceeded == false)
{
throw result.Exception;
}
if (result.HasReturnValueBySignature == false)
{
return(null);
}
else
{
return(result.ReturnValue);
}
}
private static ArgumentMatchedResult FindBestMatch(IEnumerable <ArgumentMatchedResult> results)
{
double maxScore = 0;
ArgumentMatchedResult matchResult = null;
foreach (ArgumentMatchedResult m in results)
{
if (!m.IsPassed)
{
continue;
}
if (m.Score > maxScore)
{
matchResult = m;
maxScore = m.Score;
}
}
return(matchResult);
}
private static InvokeMethodResult TryInvokeMethod(object instance, ArgumentMatchedResult matchResult)
{
MethodInfo method = matchResult.Method as MethodInfo;
if (!matchResult.IsPassed)
{
return(InvokeMethodResult.MethodNotFound());
}
try
{
object returnValue = method.Invoke(instance, matchResult.Result);
return(InvokeMethodResult.Success(method.ReturnType, returnValue));
}
catch (TargetInvocationException ex)
{
return(InvokeMethodResult.Failed(ex.InnerException));
}
catch
{
throw;
}
}
