[英]Exception handling in tasks in c#
我在任务中有异常处理问题。 我在MSDN上找到了任务中异常处理的页面,但是该示例对我不起作用...
我希望应该处理该异常,但是如果我启动程序,则会收到未处理的异常错误。
谢谢。
https://msdn.microsoft.com/zh-CN/library/dd537614%28v=vs.110%29.aspx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TaskExceptionTest
{
class Program
{
static string[] GetAllFiles(string str)
{
// Should throw an AccessDenied exception on Vista.
return System.IO.Directory.GetFiles(str, "*.txt", System.IO.SearchOption.AllDirectories);
}
static void HandleExceptions()
{
// Assume this is a user-entered string.
string path = @"C:\";
// Use this line to throw UnauthorizedAccessException, which we handle.
Task<string[]> task1 = Task<string[]>.Factory.StartNew(() => GetAllFiles(path));
// Use this line to throw an exception that is not handled.
//Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); } );
try
{
task1.Wait();
}
catch (AggregateException ae)
{
ae.Handle((x) =>
{
if (x is UnauthorizedAccessException) // This we know how to handle.
{
Console.WriteLine("You do not have permission to access all folders in this path.");
Console.WriteLine("See your network administrator or try another path.");
return true;
}
return false; // Let anything else stop the application.
});
}
Console.WriteLine("task1 has completed.");
}
static void Main(string[] args)
{
HandleExceptions();
}
}
}
返回false
将抛出异常。 如果你只是想打印的额外的错误信息,然后更换return false
以return true
,并摆脱了return
的if
块。
ae.Handle((x) =>
{
if (x is UnauthorizedAccessException) // This we know how to handle.
{
Console.WriteLine("You do not have permission to access all folders in this path.");
Console.WriteLine("See your network administrator or try another path.");
}
return true;
});
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