c# - InvalidOperationException和NullReferenceException

当我调试我的应用程序时，我收到很多InvalidOperationException和NullReferenceException，如下所示：

A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll
A first chance exception of type 'System.NullReferenceException' occurred in XGen.Framework.DLL

它会使应用程序变慢吗？

编辑：

找到发生InvalidOperationException的位置

public static Value.Locale Get(string value)
    {
        try
        { return _Items.First(itm => itm.ID.ToUpper() == value.ToUpper() || itm.Name.ToUpper() == value.ToUpper()); }
        catch (Exception)
        { return new XGen.Framework.Value.Locale(); }
    }

翻译的文本：序列中没有匹配的元素

我应该检查_Items.Count> 0吗？

最佳答案

好吧，如果它们不使您的程序变慢，那应该是例外。
如果您知道_items可以为空，这不是一个例外，那是正常流程，不应将其与例外一起处理。
您可以检查计数，或者直接调用FirstOrDefault而不是First ...

关于c# - InvalidOperationException和NullReferenceException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/8247693/