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namespace System.Web.ModelBinding {
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
// This is a single provider that can work with both byte[] and Binary models.
public sealed class BinaryDataModelBinderProvider : ModelBinderProvider {
private static readonly ModelBinderProvider[] _providers = new ModelBinderProvider[] {
new SimpleModelBinderProvider(typeof(byte[]), new ByteArrayExtensibleModelBinder()),
#if UNDEF
new SimpleModelBinderProvider(typeof(Binary), new LinqBinaryExtensibleModelBinder())
#endif
};
public override IModelBinder GetBinder(ModelBindingExecutionContext modelBindingExecutionContext, ModelBindingContext bindingContext) {
return (from provider in _providers
let binder = provider.GetBinder(modelBindingExecutionContext, bindingContext)
where binder != null
select binder).FirstOrDefault();
}
// This is essentially a clone of the ByteArrayModelBinder from core
private class ByteArrayExtensibleModelBinder : IModelBinder {
[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "We want to ignore when the data is corrupted")]
[SuppressMessage("Microsoft.Globalization", "CA1304:SpecifyCultureInfo", MessageId = "System.Web.ModelBinding.ValueProviderResult.ConvertTo(System.Type)", Justification = @"The default CultureInfo used by ValueProvider is fine.")]
public bool BindModel(ModelBindingExecutionContext modelBindingExecutionContext, ModelBindingContext bindingContext) {
ModelBinderUtil.ValidateBindingContext(bindingContext);
ValueProviderResult vpResult = bindingContext.UnvalidatedValueProvider.GetValue(bindingContext.ModelName);
// case 1: there was no <input ... /> element containing this data
if (vpResult == null) {
return false;
}
string base64string = (string)vpResult.ConvertTo(typeof(string));
// case 2: there was an <input ... /> element but it was left blank
if (String.IsNullOrEmpty(base64string)) {
return false;
}
// Future proofing. If the byte array is actually an instance of System.Data.Linq.Binary
// then we need to remove these quotes put in place by the ToString() method.
string realValue = base64string.Replace("\"", String.Empty);
try {
bindingContext.Model = ConvertByteArray(Convert.FromBase64String(realValue));
return true;
}
catch {
// corrupt data - just ignore
return false;
}
}
protected virtual object ConvertByteArray(byte[] originalModel) {
return originalModel;
}
}
#if UNDEF
// This is essentially a clone of the LinqBinaryModelBinder from core
private class LinqBinaryExtensibleModelBinder : ByteArrayExtensibleModelBinder {
protected override object ConvertByteArray(byte[] originalModel) {
return new Binary(originalModel);
}
}
#endif
}
}
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