49 lines
1.9 KiB
C#
49 lines
1.9 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="XmlPreloadedResolver.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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//------------------------------------------------------------------------------
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using System.IO;
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using System.Xml;
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using System.Threading.Tasks;
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namespace System.Xml.Resolvers {
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//
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// XmlPreloadedResolver is an XmlResolver that which can be pre-loaded with data.
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// By default it contains well-known DTDs for XHTML 1.0 and RSS 0.91.
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// Custom mappings of URIs to data can be added with the Add method.
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//
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public partial class XmlPreloadedResolver : XmlResolver {
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public override Task<Object> GetEntityAsync(Uri absoluteUri,
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string role,
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Type ofObjectToReturn) {
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if (absoluteUri == null) {
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throw new ArgumentNullException("absoluteUri");
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}
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PreloadedData data;
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if (!mappings.TryGetValue(absoluteUri, out data)) {
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if (fallbackResolver != null) {
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return fallbackResolver.GetEntityAsync(absoluteUri, role, ofObjectToReturn);
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}
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throw new XmlException(Res.GetString(Res.Xml_CannotResolveUrl, absoluteUri.ToString()));
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}
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if (ofObjectToReturn == null || ofObjectToReturn == typeof(Stream) || ofObjectToReturn == typeof(Object)) {
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return Task.FromResult<Object>(data.AsStream());
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}
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else if (ofObjectToReturn == typeof(TextReader)) {
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return Task.FromResult<Object>(data.AsTextReader());
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}
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else {
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throw new XmlException(Res.GetString(Res.Xml_UnsupportedClass));
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}
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}
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}
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}
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