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C# NotSupportedException类代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C#中System.NotSupportedException类的典型用法代码示例。如果您正苦于以下问题：C# NotSupportedException类的具体用法？C# NotSupportedException怎么用？C# NotSupportedException使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。



NotSupportedException类属于System命名空间，在下文中一共展示了NotSupportedException类的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C#代码示例。

示例1: Main

//引入命名空间
using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;

public class Example
{
   public static async Task Main()
   {
      Encoding enc = Encoding.Unicode;
      String value = "This is a string to persist.";
      Byte[] bytes  = enc.GetBytes(value);

      FileStream fs = new FileStream(@".\TestFile.dat", 
                                     FileMode.Open,
                                     FileAccess.Read);
      Task t = fs.WriteAsync(enc.GetPreamble(), 0, enc.GetPreamble().Length);
      Task t2 = t.ContinueWith( (a) => fs.WriteAsync(bytes, 0, bytes.Length) ); 
      await t2;
      fs.Close();
   }
}
开发者ID:.NET开发者，项目名称:System，代码行数:23，代码来源:NotSupportedException

输出：

Unhandled Exception: System.NotSupportedException: Stream does not support writing.
at System.IO.Stream.BeginWriteInternal(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state
, Boolean serializeAsynchronously)
at System.IO.FileStream.BeginWrite(Byte[] array, Int32 offset, Int32 numBytes, AsyncCallback userCallback, Object sta
teObject)
at System.IO.Stream.<>c.b__53_0(Stream stream, ReadWriteParameters args, AsyncCallback callback,
Object state)
at System.Threading.Tasks.TaskFactory`1.FromAsyncTrim[TInstance,TArgs](TInstance thisRef, TArgs args, Func`5 beginMet
hod, Func`3 endMethod)
at System.IO.Stream.BeginEndWriteAsync(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.FileStream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.IO.Stream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count)
at Example.Main()


示例2: Main

//引入命名空间
using System;
using System.IO;
using System.Threading.Tasks;

public class Example
{
   public static async Task Main()
   {
      String name = @".\TestFile.dat";
      var fs = new FileStream(name, 
                              FileMode.Create,
                              FileAccess.Write);
         Console.WriteLine("Filename: {0}, Encoding: {1}", 
                           name, await FileUtilities.GetEncodingType(fs));
   }
}

public class FileUtilities
{
   public enum EncodingType
   { None = 0, Unknown = -1, Utf8 = 1, Utf16 = 2, Utf32 = 3 }
   
   public async static Task<EncodingType> GetEncodingType(FileStream fs)
   {
      Byte[] bytes = new Byte[4];
      int bytesRead = await fs.ReadAsync(bytes, 0, 4);
      if (bytesRead < 2)
         return EncodingType.None;
      
      if (bytesRead >= 3 & (bytes[0] == 0xEF && bytes[1] == 0xBB && bytes[2] == 0xBF))
         return EncodingType.Utf8;
      
      if (bytesRead == 4) { 
         var value = BitConverter.ToUInt32(bytes, 0);
         if (value == 0x0000FEFF | value == 0xFEFF0000)
            return EncodingType.Utf32;
      }
      
      var value16 = BitConverter.ToUInt16(bytes, 0);
      if (value16 == (ushort)0xFEFF | value16 == (ushort)0xFFFE) 
         return EncodingType.Utf16;
      
      return EncodingType.Unknown;
   }
}
开发者ID:.NET开发者，项目名称:System，代码行数:46，代码来源:NotSupportedException

输出：

Unhandled Exception: System.NotSupportedException: Stream does not support reading.
at System.IO.FileStream.BeginRead(Byte[] array, Int32 offset, Int32 numBytes, AsyncCallback callback, Object state)
at System.IO.Stream.<>c.b__46_0(Stream stream, ReadWriteParameters args, AsyncCallback callback, Object state)
at System.Threading.Tasks.TaskFactory`1.FromAsyncTrim[TInstance, TArgs](TInstance thisRef, TArgs args, Func`5 beginMethod, Func`3 endMethod)
at System.IO.Stream.BeginEndReadAsync(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.FileStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.IO.Stream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count)
at FileUtilities.GetEncodingType(FileStream fs) in C:\Work\docs\program.cs:line 26
at Example.Main() in C:\Work\docs\program.cs:line 13
at Example.
()


示例3: GetEncodingType

public static async Task<EncodingType> GetEncodingType(FileStream fs)
   {
      if (!fs.CanRead) 
         return EncodingType.Unknown;

      Byte[] bytes = new Byte[4];
      int bytesRead = await fs.ReadAsync(bytes, 0, 4);
      if (bytesRead < 2)
         return EncodingType.None;
      
      if (bytesRead >= 3 & (bytes[0] == 0xEF && bytes[1] == 0xBB && bytes[2] == 0xBF))
         return EncodingType.Utf8;
      
      if (bytesRead == 4) { 
         var value = BitConverter.ToUInt32(bytes, 0);
         if (value == 0x0000FEFF | value == 0xFEFF0000)
            return EncodingType.Utf32;
      }
      
      var value16 = BitConverter.ToUInt16(bytes, 0);
      if (value16 == (ushort)0xFEFF | value16 == (ushort)0xFFFE) 
         return EncodingType.Utf16;
      
      return EncodingType.Unknown;
   }
}
开发者ID:.NET开发者，项目名称:System，代码行数:26，代码来源:NotSupportedException

输出：

Filename: .\TestFile.dat, Encoding: Unknown



注：本文中的System.NotSupportedException类示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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