Question

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

该技术效果很好，直到我尝试标签大于9的单选按钮。

在这种情况下，单击单选按钮

时会发生错误

System.InvalidOperationException未处理HResult = -2146233079
Message = DataBinding无法在列表中找到适合的行所有绑定。 Source = System StackTrace：在System.ComponentModel.ReflectPropertyDescriptor.SetValue（Object 组件，对象值）在System.Windows.Forms.BindToObject.SetValue（对象值）在System.Windows.Forms.Binding.PullData（布尔重新格式，布尔力）在System.Windows.Forms.Binding.Target_PropertyChanged（Object sender，EventArgs e）在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：第70行在System.EventHandler.Invoke（Object sender，EventArgs e）在System.Windows.Forms.RadioButton.OnClick（EventArgs e）在System.Windows.Forms.RadioButton.OnMouseUp（MouseEventArgs mevent）在System.Windows.Forms.Control.WmMouseUp（消息＆amp; m，MouseButtons按钮，Int32点击）在System.Windows.Forms.Control.WndProc（消息＆amp; m）在System.Windows.Forms.ButtonBase.WndProc（消息＆amp; m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG＆amp; msg）在System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop（IntPtr） dwComponentID，Int32原因，Int32 pvLoopData）在System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32）原因，ApplicationContext上下文）在System.Windows.Forms.Application.ThreadContext.RunMessageLoop（Int32）原因，ApplicationContext上下文）在System.Windows.Forms.Form.ShowDialog（IWin32Window所有者）在e：\ EShared \ devnet10 \ VivSnap \ Main \ Form1.cs中的SBD.VivSnap.Main.Form1.btnForm1Go_Click（Object sender，EventArgs e）：第36行在System.Windows.Forms.Button.OnMouseUp（MouseEventArgs mevent）在System.Windows.Forms.Control.WmMouseUp（消息＆amp; m，MouseButtons按钮，Int32点击）在System.Windows.Forms.Control.WndProc（消息＆amp; m）在System.Windows.Forms.ButtonBase.WndProc（消息＆amp; m）在System.Windows.Forms.Button.WndProc（消息＆amp; m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG＆amp; msg）在System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop（IntPtr） dwComponentID，Int32原因，Int32 pvLoopData）在System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32）原因，ApplicationContext上下文）在System.Windows.Forms.Application.ThreadContext.RunMessageLoop（Int32）原因，ApplicationContext上下文）在SB：.VivSnap.Main.Program.Main（）在e：\ EShared \ devnet10 \ VivSnap \ Main \ Program.cs：第18行在System.AppDomain._nExecuteAssembly（RuntimeAssembly程序集，String [] args）在Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly（）在System.Threading.ExecutionContext.RunInternal（ExecutionContext executionContext，ContextCallback回调，对象状态，布尔值 preserveSyncCtx） at System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback callback，Object state，Boolean preserveSyncCtx）在System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback回调，对象状态）在System.Threading.ThreadHelper.ThreadStart（）InnerException：

我绑定属性的代码是

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

该属性的代码是

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，我不会收到错误。

public int PrinterTypeNum { get; set; }

My Radio Group课程如下 // 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

问题是因为我有另一个依赖于所选值的属性绑定。我有＆＃34; Machine.Mode＆＃34;作为绑定属性，其中Machine属性的类型取决于PrintType属性

Answer 2

我在一个数据绑定组件中将.Visible属性更改为false时出现此错误。

解决方法是在将.Visible属性更改为false之前删除控件上的DataBindings，然后在再次显示DataBindings时将其添加回来。

以下是用于说明错误以及如何解决错误的代码：

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");
    }
}

DataBinding在列表中找不到适合所有绑定的行，使用的RadioButton Group在组中超过9

2 个答案: