里面的Linq catch异常 [英] Catch exception inside Linq

问题描述

我在C＃-code有这个问题。我让我的LINQ代码中的异常，并想知道如何抓住它。的我已搜查左右，但找不到任何相关问题的

I have this problem in my C#-code. I get an exception inside my Linq-code and would like to know how to catch it. I have searched SO but cannot find any relevant issues.

我已经简化我的查询到这一点：

I have simplified my query to this:

var test = from values in myTable.AsEnumerable()
select new valueSet
{
    ID = values["ID"].ToString(),
    Number = values["Number"].ToString(),
    Name = this.getName(values["Number"].ToString()),
}

由于我运行该功能时的获得查询中的异常的的getName 我希望能够捕获异常，也该 编号的我目前是。事情是这样的：

Since I get an exception inside the query when running the function getName I want to be able to catch the exception and also which Number I am currently at. Something like this:

try 
{           
    var test = from values in myTable.AsEnumerable()
    select new valueSet
    {
        ID = values["ID"].ToString(),
        Number = values["Number"].ToString(),
        Name = this.getName(values["Number"].ToString()),
    }
catch (Exception ex)
{
    //I want to use "Number" here!
    throw ex;
}

我意识到我宣布尝试里面我的测试变量，但能我为每一个LINQ循环存储当前号码？有什么建议么？

I am aware of that I declare my test-variable inside the try but can I for each "linq-loop" store the current Number? Any suggestions?

推荐答案

要实现这一点，你将不得不使用使用扩展方法和lambda表达式其他LINQ语法：

To achieve this, you will have to use the "other" LINQ syntax that uses extension methods and lambdas:

var test = myTable.AsEnumerable().Select(values =>
{
    try
    {
        return new valueSet
        {
            ID = values["ID"].ToString(),
            Number = values["Number"].ToString(),
            Name = this.getName(values["Number"].ToString()),
        };
    }
    catch(Exception ex)
    {
        throw new ApplicationException("cannot load number" + values["Number"].ToString());
    }
});

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