Windows表单应用程序exception

我得到应用程序exception

at System.Windows.Forms.CurrencyManager.get_Item(Int32 index) at System.Windows.Forms.CurrencyManager.get_Current() at System.Windows.Forms.DataGridView.DataGridViewDataConnection.OnRowEnter(DataGridViewCellEventArgs e) at System.Windows.Forms.DataGridView.OnRowEnter(DataGridViewCell& dataGridViewCell, Int32 columnIndex, Int32 rowIndex, Boolean canCreateNewRow, Boolean validationFailureOccurred) at System.Windows.Forms.DataGridView.SetCurrentCellAddressCore(Int32 columnIndex, Int32 rowIndex, Boolean setAnchorCellAddress, Boolean validateCurrentCell, Boolean throughMouseClick) at System.Windows.Forms.DataGridView.OnCellMouseDown(HitTestInfo hti, Boolean isShiftDown, Boolean isControlDown) at System.Windows.Forms.DataGridView.OnCellMouseDown(DataGridViewCellMouseEventArgs e) at System.Windows.Forms.DataGridView.OnMouseDown(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.DataGridView.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at MedForms.Program.Main() in F:\Projects\Vstu\MedForms\MedForms\Program.cs:line 18 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() 

每次我尝试单击DataGridView时。

我收到错误消息

{“索引-1没有值。”}（SystemIndexOutOfaRangeexception）。

在行上

 Application.Run(new MainForm()); 

我无法调试它。 请帮我找到可能导致此类问题的原因以及如何调试它？

Answer 1

我猜你已经将一个最初为空的List（或其他不生成列表更改事件的集合） DataGridView到DataGridView ，然后将项添加到此List。

您添加的项目将在网格上正确显示 ，但单击一行将导致此exception。 这是因为底层CurrencyManager将其当前行位置报告为-1的偏移量。 它将保持这种状态，因为List不会报告对网格的更改。

您应该只将列表绑定到网格中，如果它中包含一些项目，或者在添加它们时重新绑定。

另请参阅我对这个问题的回答， 这个问题基本上是一样的。

Answer 2

按照安迪的建议，我替换了

private List Employees { get; set; } = new List(); _employeesGridView.DataSource = Employees;

同

private BindingList Employees { get; set; } = new BindingList(); _employeesGridView.DataSource = Employees;

问题消失了。