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namespace System.Web.ModelBinding {
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
public class ModelBindingContext {
private ModelBinderProviderCollection _modelBinderProviders;
private ModelMetadata _modelMetadata;
private string _modelName;
private ModelStateDictionary _modelState;
private Dictionary<string, ModelMetadata> _propertyMetadata;
private ModelValidationNode _validationNode;
private IValueProvider _valueProvider;
public ModelBindingContext()
: this(null) {
ValidateRequest = true;
}
// copies certain values that won't change between parent and child objects,
// e.g. ValueProvider, ModelState
public ModelBindingContext(ModelBindingContext bindingContext) {
if (bindingContext != null) {
ModelBinderProviders = bindingContext.ModelBinderProviders;
ModelState = bindingContext.ModelState;
ValueProvider = bindingContext.ValueProvider;
ValidateRequest = bindingContext.ValidateRequest;
}
}
public object Model {
get {
EnsureModelMetadata();
return ModelMetadata.Model;
}
set {
EnsureModelMetadata();
ModelMetadata.Model = value;
}
}
[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "This is writeable to support unit testing")]
public ModelBinderProviderCollection ModelBinderProviders {
get {
if (_modelBinderProviders == null) {
_modelBinderProviders = System.Web.ModelBinding.ModelBinderProviders.Providers;
}
return _modelBinderProviders;
}
set {
_modelBinderProviders = value;
}
}
public ModelMetadata ModelMetadata {
get {
return _modelMetadata;
}
set {
_modelMetadata = value;
}
}
public string ModelName {
get {
if (_modelName == null) {
_modelName = String.Empty;
}
return _modelName;
}
set {
_modelName = value;
}
}
public bool ValidateRequest {
get;
set;
}
[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "This is writeable to support unit testing")]
public ModelStateDictionary ModelState {
get {
if (_modelState == null) {
_modelState = new ModelStateDictionary();
}
return _modelState;
}
set {
_modelState = value;
}
}
public Type ModelType {
get {
EnsureModelMetadata();
return ModelMetadata.ModelType;
}
}
public IDictionary<string, ModelMetadata> PropertyMetadata {
get {
if (_propertyMetadata == null) {
_propertyMetadata = ModelMetadata.Properties.ToDictionary(m => m.PropertyName, StringComparer.OrdinalIgnoreCase);
}
return _propertyMetadata;
}
}
public ModelValidationNode ValidationNode {
get {
if (_validationNode == null) {
_validationNode = new ModelValidationNode(ModelMetadata, ModelName);
}
return _validationNode;
}
set {
_validationNode = value;
}
}
public IValueProvider ValueProvider {
get {
return _valueProvider;
}
set {
_valueProvider = value;
}
}
internal IUnvalidatedValueProvider UnvalidatedValueProvider {
get {
return (ValueProvider as IUnvalidatedValueProvider ?? new UnvalidatedValueProviderWrapper(ValueProvider));
}
}
private void EnsureModelMetadata() {
if (ModelMetadata == null) {
throw Error.ModelBindingContext_ModelMetadataMustBeSet();
}
}
// Used to wrap an IValueProvider in an IUnvalidatedValueProvider
private sealed class UnvalidatedValueProviderWrapper : IValueProvider, IUnvalidatedValueProvider {
private readonly IValueProvider _backingProvider;
public UnvalidatedValueProviderWrapper(IValueProvider backingProvider) {
_backingProvider = backingProvider;
}
public ValueProviderResult GetValue(string key, bool skipValidation) {
// 'skipValidation' isn't understood by the backing provider and can be ignored
return GetValue(key);
}
public bool ContainsPrefix(string prefix) {
return _backingProvider.ContainsPrefix(prefix);
}
public ValueProviderResult GetValue(string key) {
return _backingProvider.GetValue(key);
}
}
}
}
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