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