如何解决targetinvocationexception？ [英] How to solve targetinvocationexception?

问题描述

抛出'System.Reflection.TargetInvocationException'。我不明白为什么innerException会告诉IsolatedStorage，因为我在sdCard中创建了该文件夹。

 _ className   System.Reflection.TargetInvocationException 
 _innerException {System.IO.IsolatedStorage.IsolatedStorageException：IsolatedStorageFileStream上不允许操作。 
在System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor（ String 路径，FileMode模式，FileAccess访问，FileShare共享， Int32  bufferSize，IsolatedStorageFile isf）
 at System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor（ String  path，FileMode mode，IsolatedStorageFile isf ）
在MarketApp.ShortTimeStoring。< FillPricesFromIsoStore> d__0.MoveNext（）
 ---堆栈跟踪结束来自之前的位置抛出异常--- 
在System.Runtime.CompilerServices.AsyncMethodBuilderCore。< ThrowAsync> b__3（ Object  state）} 
 _message  调用目标抛出了异常。 
 IsTransient  false  
来源< span class =code-string>  mscorlib 

我的尝试：



这是我的代码：

 StorageFolder myFolder =  await  KnownFolders.PicturesLibrary.CreateFolderAsync（  MarketApp，CreationCollisionOption.ReplaceExisting）; 
 StorageFile myFile =  await  myFolder.CreateFileAsync（  Products.txt，CreationCollisionOption.ReplaceExisting）; 
流f = 等待 myFile.OpenStreamForWriteAsync（）; 
 使用（StreamWriter sw =  new  StreamWriter（f））
 {
 sw.WriteLine（  Hello world！）; 
} 

解决方案

代码中的某处出现严重错误。但找到根本原因的唯一方法是使用调试器逐步执行代码并确切检查发生了什么。

我找到了InnerException的位置，我发现问题出在其他地方

'System.Reflection.TargetInvocationException' is thrown. I don't understand why the innerException tells something about IsolatedStorage because I create that folder in sdCard.

_className	"System.Reflection.TargetInvocationException"
_innerException	{System.IO.IsolatedStorage.IsolatedStorageException: Operation not permitted on IsolatedStorageFileStream.
   at System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, IsolatedStorageFile isf)
   at System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, IsolatedStorageFile isf)
   at MarketApp.ShortTimeStoring.<FillPricesFromIsoStore>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__3(Object state)}
_message	"Exception has been thrown by the target of an invocation."
IsTransient	false
Source	"mscorlib"

What I have tried:

This is my code:

StorageFolder myFolder = await KnownFolders.PicturesLibrary.CreateFolderAsync("MarketApp", CreationCollisionOption.ReplaceExisting);
StorageFile myFile = await myFolder.CreateFileAsync("Products.txt", CreationCollisionOption.ReplaceExisting);
Stream f = await myFile.OpenStreamForWriteAsync();
using (StreamWriter sw = new StreamWriter(f))
{
    sw.WriteLine("Hello world!");
}

解决方案

There is something seriously wrong, somewhere in your code. But the only way to find the root cause is to step through the code with your debugger and check exactly what is happening.

I found the place for InnerException and I found out that problem was elsewhere.

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