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namespace System.Web.ModelBinding {
using System;
// Returns a user-specified binder for a given open generic type.
public sealed class GenericModelBinderProvider : ModelBinderProvider {
private readonly Func<Type[], IModelBinder> _modelBinderFactory;
private readonly Type _modelType;
public GenericModelBinderProvider(Type modelType, IModelBinder modelBinder) {
if (modelType == null) {
throw new ArgumentNullException("modelType");
}
if (modelBinder == null) {
throw new ArgumentNullException("modelBinder");
}
ValidateParameters(modelType, null /* modelBinderType */);
_modelType = modelType;
_modelBinderFactory = _ => modelBinder;
}
public GenericModelBinderProvider(Type modelType, Type modelBinderType) {
// The binder can be a closed type, in which case it will be instantiated directly. If the binder
// is an open type, the type arguments will be determined at runtime and the corresponding closed
// type instantiated.
if (modelType == null) {
throw new ArgumentNullException("modelType");
}
if (modelBinderType == null) {
throw new ArgumentNullException("modelBinderType");
}
ValidateParameters(modelType, modelBinderType);
bool modelBinderTypeIsOpenGeneric = modelBinderType.IsGenericTypeDefinition;
_modelType = modelType;
_modelBinderFactory = typeArguments => {
Type closedModelBinderType = (modelBinderTypeIsOpenGeneric) ? modelBinderType.MakeGenericType(typeArguments) : modelBinderType;
return (IModelBinder)Activator.CreateInstance(closedModelBinderType);
};
}
public GenericModelBinderProvider(Type modelType, Func<Type[], IModelBinder> modelBinderFactory) {
if (modelType == null) {
throw new ArgumentNullException("modelType");
}
if (modelBinderFactory == null) {
throw new ArgumentNullException("modelBinderFactory");
}
ValidateParameters(modelType, null /* modelBinderType */);
_modelType = modelType;
_modelBinderFactory = modelBinderFactory;
}
public Type ModelType {
get {
return _modelType;
}
}
public bool SuppressPrefixCheck {
get;
set;
}
public override IModelBinder GetBinder(ModelBindingExecutionContext modelBindingExecutionContext, ModelBindingContext bindingContext) {
ModelBinderUtil.ValidateBindingContext(bindingContext);
Type[] typeArguments = null;
if (ModelType.IsInterface) {
Type matchingClosedInterface = TypeHelpers.ExtractGenericInterface(bindingContext.ModelType, ModelType);
if (matchingClosedInterface != null) {
typeArguments = matchingClosedInterface.GetGenericArguments();
}
}
else {
typeArguments = TypeHelpers.GetTypeArgumentsIfMatch(bindingContext.ModelType, ModelType);
}
if (typeArguments != null) {
if (SuppressPrefixCheck || bindingContext.UnvalidatedValueProvider.ContainsPrefix(bindingContext.ModelName)) {
return _modelBinderFactory(typeArguments);
}
}
return null;
}
private static void ValidateParameters(Type modelType, Type modelBinderType) {
if (!modelType.IsGenericTypeDefinition) {
throw Error.GenericModelBinderProvider_ParameterMustSpecifyOpenGenericType(modelType, "modelType");
}
if (modelBinderType != null) {
if (!typeof(IModelBinder).IsAssignableFrom(modelBinderType)) {
throw Error.Common_TypeMustImplementInterface(modelBinderType, typeof(IModelBinder), "modelBinderType");
}
if (modelBinderType.IsGenericTypeDefinition) {
if (modelType.GetGenericArguments().Length != modelBinderType.GetGenericArguments().Length) {
throw Error.GenericModelBinderProvider_TypeArgumentCountMismatch(modelType, modelBinderType);
}
}
}
}
}
}
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