winforms - DataBinding 在列表中找不到适合使用组中超过 9 个单选按钮组的所有绑定(bind)的行

Question

我正在使用描述的技术 here将单选按钮组添加到我的 C# winforms 应用程序。

该技术工作得很好，直到我尝试使用标签大于 9 的单选按钮。

在这种情况下，当我单击单选按钮时会发生错误

System.InvalidOperationException was unhandled HResult=-2146233079
Message=DataBinding cannot find a row in the list that is suitable for all bindings. Source=System StackTrace: at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object component, Object value) at System.Windows.Forms.BindToObject.SetValue(Object value) at System.Windows.Forms.Binding.PullData(Boolean reformat, Boolean force) at System.Windows.Forms.Binding.Target_PropertyChanged(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at SBD.VivSnap.UI.RadioGroupBox.radioButton_CheckedChanged(Object sender, EventArgs e) in e:\EShared\devnet10\VivSnap\SnapInUI\RadioGroupBox.cs:line 70 at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Windows.Forms.RadioButton.OnClick(EventArgs e) at System.Windows.Forms.RadioButton.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.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.Form.ShowDialog(IWin32Window owner) at SBD.VivSnap.Main.Form1.btnForm1Go_Click(Object sender, EventArgs e) in e:\EShared\devnet10\VivSnap\Main\Form1.cs:line 36 at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.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 SBD.VivSnap.Main.Program.Main() in e:\EShared\devnet10\VivSnap\Main\Program.cs:line 18 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException:

我的绑定(bind)属性的代码是

groupBox.DataBindings.Add("Selected", dataSource, PrinterTypeNum, false, DataSourceUpdateMode.OnPropertyChanged);

我的属性代码是

public int PrinterTypeNum  
{
    get
    {
        try
        {
            return (int)this.PrinterType;
        }
        catch (Exception)
        {
            return 0;
        }
    }
    set
    {
        try
        {
            this.PrinterType = (jtVivPrinterEnum)value;
            // the enum goes from 0 to 15
        }
        catch (Exception)
        {
            this.PrinterType = jtVivPrinterEnum.jtVivPrinterUnknown;
            throw;
        }
    }
}

public jtVivPrinterEnum PrinterType { get; set; }

**

[更新]我刚刚发现，如果属性如下所示，我不会收到错误。

public int PrinterTypeNum { get; set; }

我的 radio 组类(class)如下 //Best way to databind a group of radiobuttons in WinForms

public partial class RadioGroupBox : GroupBox
{
    public RadioGroupBox()
    {
        this.InitializeComponent();
    }

    public event EventHandler SelectedChanged = delegate { };
    int _selected;
    public int Selected
    {
        get
        {
            return this._selected;
        }
        set
        {
            int val = 0;
            var radioButton = this.Controls.OfType<RadioButton>()
            .FirstOrDefault(radio => radio.Tag != null
            && int.TryParse(radio.Tag.ToString(), out val) && val == value);

            if (radioButton != null)
            {
                try
                {
                    radioButton.Checked = true;
                    this._selected = val;
                }
                catch (Exception ex)
                {
                    Debug.Print(ex.ToString());
                    throw;
                }
            }
        }
    }

    protected override void OnControlAdded(ControlEventArgs e)
    {
        base.OnControlAdded(e);
        var radioButton = e.Control as RadioButton;
        if (radioButton != null)
            radioButton.CheckedChanged += this.radioButton_CheckedChanged;
    }

    void radioButton_CheckedChanged(object sender, EventArgs e)
    {
        var radio = (RadioButton)sender;
        int val = 0;
        if (radio.Checked && radio.Tag != null
        && int.TryParse(radio.Tag.ToString(), out val))
        {
            this._selected = val;
            this.SelectedChanged(this, new EventArgs());  // raises error when val=10
        }
    }
}

Answer 1

当我在数据绑定(bind)组件之一中将 .Visible 属性更改为 false 时，出现此错误。

解决方法是在将控件的 .Visible 属性更改为 false 之前删除控件上的 DataBindings，然后在使其再次可见时添加 DataBindings。

以下代码用于说明该错误以及如何解决该错误:

void SetupStuff()
{
    BindingSource myBindingSource = new BindingSource();
    // Retrieve my data into a DataTable and add it to the BindingSource
    DataTable myDataTable = GetMyDataTable(); 
    myBindingSource.DataSource = myDataTable.DefaultView;

    // Add DataBindings to Visible components only
    myTextBox.Visible = true;
    myTextBox.DataBindings.Add("Text", myBindingSource, "MySecret");
}

void UpdateStuff()
{
    // Update the currently selected data record
    myDataTable.DefaultView[myBindingSource.Position].BeginEdit();
    myDataTable.DefaultView[myBindingSource.Position]["MySecret"] = "Top Secret Meetup " + DateTime.Now.AddDays(1).ToString();
    myDataTable.DefaultView[myBindingSource.Position].EndEdit();
    myDataTable.DefaultView[myBindingSource.Position].AcceptChanges();
    // if myTextBox.Visible, then we can see the message
}

void HideStuff()
{
    myTextBox.Visible = false;
    UpdateStuff();

    // After myDataTable..AcceptChanges(), DataBindings are now BROKEN!
    // This Cleared all data from controls bound to myBindingSource 
    try
    {
        myBindingSource.ResetCurrent();
    }
    catch (Exception brokenBindingSource)
    {
        Console.WriteLine("DataBinding broken" + brokenBindingSource.Message);
    }
}

void HideStuff()
{
    if (myTextBox.Visible)
    {
        myTextBox.DataBindings.Remove("MySecret");
        myTextBox.Visible = false;
    }
    UpdateStuff();

    // After myDataTable..AcceptChanges(), DataBindings are now BROKEN!
    // This Cleared all data from controls bound to myBindingSource 
    try
    {
        myBindingSource.ResetCurrent();
    }
    catch (Exception brokenBiSo)
    {
        Console.WriteLine("DataBinding is broken" + brokenBiSo.Message);
    }
}

void ShowStuff()
{
    // If I want to make the component visible again, do this:
    if (!myTextBox.Visible)
    {
        myTextBox.Visible = true;
        myTextBox.DataBindings.Add("Text", myBindingSource, "MySecret");
    }
}