WinRT目标多字节代码页中不存在用于Unicode字符的映射 [英] WinRT No mapping for the Unicode character exists in the target multi-byte code page

问题描述

我试图在我的Windows 8商店应用程序中读取一个文件。这里是我用来实现这一点的代码片段：

$ p $ $ $ $ c $ if $（$！= null）
{
var stream =等待file.OpenAsync（FileAccessMode.Read）;
var size = stream.Size;
using（var inputStream = stream.GetInputStreamAt（0））
{
DataReader dataReader = new DataReader（inputStream）;
uint numbytes =等待dataReader.LoadAsync（（uint）size）;
string text = dataReader.ReadString（numbytes）;






$ b

但是， p>

  string text = dataReader.ReadString（numbytes）; 
  

执行讯息：

 目标多字节代码页中不存在用于Unicode字符的映射。 
  

我如何得到这个？

  if 
 （file！= null）
 {
 IBuffer buffer =等待FileIO.ReadBufferAsync（file）; 
 DataReader reader = DataReader.FromBuffer（buffer）; 
 byte [] fileContent = new byte [reader.UnconsumedBufferLength]; 
 reader.ReadBytes（fileContent）; 
 string text = Encoding.UTF8.GetString（fileContent，0，fileContent.Length）; 
 
 
 
 
 
 $ b 
有人请详细说明，为什么我的初始方法不起作用？ p> 
I am trying to read a file in my Windows 8 Store App. Here is a fragment of code I use to achieve this:
        if(file != null)
        {
            var stream = await file.OpenAsync(FileAccessMode.Read);
            var size = stream.Size;
            using(var inputStream = stream.GetInputStreamAt(0))
            {
                DataReader dataReader = new DataReader(inputStream);
                uint numbytes = await dataReader.LoadAsync((uint)size);
                string text = dataReader.ReadString(numbytes);
            }
        }
However, an exeption is thrown at line:
string text = dataReader.ReadString(numbytes);
Exeption message:
No mapping for the Unicode character exists in the target multi-byte code page.
How do I get by this?
解决方案
I managed to read file correctly using similar approach to suggested by duDE:
        if(file != null)
        {
            IBuffer buffer = await FileIO.ReadBufferAsync(file);
            DataReader reader = DataReader.FromBuffer(buffer);
            byte[] fileContent = new byte[reader.UnconsumedBufferLength];
            reader.ReadBytes(fileContent);
            string text = Encoding.UTF8.GetString(fileContent, 0, fileContent.Length);
        }
Can somebody please elaborate, why my initial approach didn't work?

                        
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