1

一段时间以来,我一直在使用自定义复选框控件并发布了此问题...看来问题与事件无关。

自定义控件是一个带有复选框的组框。当复选框为 false 时,应禁用所有组控件。这听起来很简单,但问题是当内部控件失去焦点时,会触发检查的更改事件。

经过更多的挖掘,我想我已经将其范围缩小到已检查属性与另一个对象的绑定。包含绑定时,它工作不正确,但删除绑定后,一切都按预期工作。

现在我不确定如何解决这个问题。

任何人都可以帮忙吗?

这是我的测试应用程序中的一些代码-

表格: 在此处输入图像描述

表格代码:

public partial class Form1 : Form
{
    TestProperties m_TP;

    public Form1()
    {
        // Create instance of TestProperties
        m_TP = new TestProperties();

        InitializeComponent();

        BindControls();
    }

    private void BindControls()
    {
        // Bind the values to from the controls in the group to the properties class

        // When the line below is commented out the control behaves normally
        //this.checkedGroupBox1.DataBindings.Add("Checked", m_TP, "GroupChecked");
        this.numericUpDown1.DataBindings.Add("Value", m_TP, "SomeNumber");
        this.textBox1.DataBindings.Add("Text", m_TP, "SomeText");
        this.checkBox1.DataBindings.Add("Checked", m_TP, "BoxChecked");

        // Bind the values of the properties to the lables
        this.label4.DataBindings.Add("Text", m_TP, "GroupChecked");
        this.label5.DataBindings.Add("Text", m_TP, "SomeNumber");
        this.label6.DataBindings.Add("Text", m_TP, "SomeText");
        this.label8.DataBindings.Add("Text", m_TP, "BoxChecked");
    }
}

一个属性存储类:

class TestProperties
{
    public bool GroupChecked { get; set; }
    public decimal SomeNumber { get; set; }
    public string SomeText { get; set; }
    public bool BoxChecked { get; set; }

    public TestProperties()
    {
        GroupChecked = false;
        SomeNumber = 0;
        SomeText = string.Empty;
        BoxChecked = true;
    }
}

编辑: 这是我的自定义控件的来源:

/// <summary>
/// Custom control to create a checked group box.
/// Enables / disables all controls within the group depending upon the state of the check box
/// </summary>
public class CheckedGroupBox : System.Windows.Forms.GroupBox
{
    #region Private Member Variables
    private System.ComponentModel.IContainer components = null;

    /// <summary>
    /// Checkbox to enable / disable the controls within the group
    /// </summary>
    private CheckBox chkBox;

    /// <summary>
    /// Label for the group box which is set to autosize
    /// </summary>
    private Label lblDisplay;
    #endregion

    /// <summary>
    ///  Default constructor for the control
    /// </summary>
    public CheckedGroupBox()
    {
        // This call is required by the Windows Form Designer.
        InitializeComponent();

        // The text of these controls should always be empty.
        this.Text = "";
        this.chkBox.Text = "";
    }

    #region Events & Delegates

    /// <summary>
    /// Event to forward the change in checked flag
    /// </summary>
    public event EventHandler CheckedChanged;

    /// <summary>
    /// Event to forward the change in checked state of the checkbox
    /// </summary>
    public event EventHandler CheckStateChanged;

    private void chkBox_CheckedChanged(object sender, EventArgs e)
    {
        // Disable the controls within the group
        foreach (Control ctrl in this.Controls)
        {
            if (ctrl.Name != "chkBox" && ctrl.Name != "lblDisplay")
            {
                ctrl.Enabled = this.chkBox.Checked;
            }
        }

        // Now forward the Event from the checkbox
        if (this.CheckedChanged != null)
        {
            this.CheckedChanged(sender, e);
        }
    }

    private void chkBox_CheckStateChanged(object sender, EventArgs e)
    {
        // Forward the Event from the checkbox
        if (this.CheckStateChanged != null)
        {
            this.CheckStateChanged(sender, e);
        }
    }

    #endregion

    #region Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.chkBox = new System.Windows.Forms.CheckBox();
        this.lblDisplay = new System.Windows.Forms.Label();
        this.SuspendLayout();
        // 
        // chkBox
        // 
        this.chkBox.Location = new System.Drawing.Point(8, 0);
        this.chkBox.Name = "chkBox";
        this.chkBox.Size = new System.Drawing.Size(16, 16);
        this.chkBox.TabIndex = 0;
        this.chkBox.CheckStateChanged += new System.EventHandler(this.chkBox_CheckStateChanged);
        this.chkBox.CheckedChanged += new System.EventHandler(this.chkBox_CheckedChanged);
        // 
        // lblDisplay
        // 
        this.lblDisplay.AutoSize = true;
        this.lblDisplay.Location = new System.Drawing.Point(24, 0);
        this.lblDisplay.Name = "lblDisplay";
        this.lblDisplay.Size = new System.Drawing.Size(97, 13);
        this.lblDisplay.TabIndex = 1;
        this.lblDisplay.Text = "CheckedGroupBox";
        // 
        // CheckedGroupBox
        // 
        this.BackColor = System.Drawing.Color.AliceBlue;
        this.Controls.Add(this.chkBox);
        this.Controls.Add(this.lblDisplay);
        this.Size = new System.Drawing.Size(100, 100);
        this.ResumeLayout(false);
        this.PerformLayout();

    }
    #endregion

    #region Public properties

    [Bindable(true), Category("Appearance"), DefaultValue("Check Group Text")]
    public override string Text
    {
        get{ return this.lblDisplay.Text; }
        set{ this.lblDisplay.Text = value; }
    }

    [Bindable(true), Category("Appearance"), DefaultValue("Checked")]
    public System.Windows.Forms.CheckState CheckState
    {
        get{ return this.chkBox.CheckState; }
        set
        { 
            this.chkBox.CheckState = value; 

            foreach( Control ctrl in this.Controls )
            {
                if( ctrl.Name != "chkBox" && ctrl.Name != "lblDisplay" )
                {
                    ctrl.Enabled = this.chkBox.Checked;
                }
            }
        }
    }

    [Bindable(true), Category("Appearance"), DefaultValue("True")]
    public bool Checked
    {
        get{ return this.chkBox.Checked; }
        set
        { 
            this.chkBox.Checked = value; 

            foreach( Control ctrl in this.Controls )
            {
                if( ctrl.Name != "chkBox" && ctrl.Name != "lblDisplay" )
                {
                    ctrl.Enabled = this.chkBox.Checked;
                }
            }
        }
    }

    [Bindable(true), Category("Behavior"), DefaultValue("False")]
    public bool ThreeState
    {
        get{ return this.chkBox.ThreeState; }
        set{ this.chkBox.ThreeState = value; }
    }

    #endregion

}
4

3 回答 3

2

您需要按如下方式更改 BindControls 方法。这样做的原因是,默认情况下,控件正在更新以反映 m_TP 的属性,但是当它们的值发生更改时,更改不会反映在 m_TP 中(我猜 Leave 事件会导致控件重新绑定到它们的数据源)。通过添加 DataSourceUpdateMode 参数,将双向进行更改。

private void BindControls()
{
    // Bind the values to from the controls in the group to the properties class

    // When the line below is commented out the control behaves normally
    this.checkedGroupBox1.DataBindings.Add("Checked", m_TP, "GroupChecked", false, DataSourceUpdateMode.OnPropertyChanged);
    this.numericUpDown1.DataBindings.Add("Value", m_TP, "SomeNumber", false, DataSourceUpdateMode.OnPropertyChanged);
    this.textBox1.DataBindings.Add("Text", m_TP, "SomeText", false, DataSourceUpdateMode.OnPropertyChanged);
    this.checkBox1.DataBindings.Add("Checked", m_TP, "BoxChecked", false, DataSourceUpdateMode.OnPropertyChanged);

    // Bind the values of the properties to the lables
    this.label4.DataBindings.Add("Text", m_TP, "GroupChecked");
    this.label5.DataBindings.Add("Text", m_TP, "SomeNumber");
    this.label6.DataBindings.Add("Text", m_TP, "SomeText");
    this.label8.DataBindings.Add("Text", m_TP, "BoxChecked");
}
于 2011-10-28T11:31:52.153 回答
1

首先,为了让您的绑定正常工作,您需要在您的属性存储类上实现 INotifyPropertyChanged。请在此处查看示例

在您的 Visual Studio 环境中创建一个指向类型“对象”的新数据源。选择您的 TestProperties 类作为源对象(如果该类未显示在列表中,请确保您已构建包含程序集并且您的 WinForm 项目具有对它的引用)。

数据源配置向导

现在,将 BindingSource 从您的工具箱拖到您的自定义控件上。将 BindingSource 的 DataSource 属性设置为您在上一步中创建的 TestProperties 数据源。

现在,选择自定义控件组框并转到 (DataBindings) 部分。单击高级字段中的“...”。将自定义网格控件的“启用”属性绑定到 BindingSource 的“BoxChecked”属性。这一切都可以在设计器中完成(如果您愿意,也可以通过后面的代码)

在此处输入图像描述

通过 BindingSource 将自定义控件上的其他 WinForms 元素绑定到 TestProperties 类的相应元素。

现在,在自定义控件上公开一个属性,以便您可以在“父”表单中绑定到它。确保将 BindingSource 的“DataSource”设置为新的引用属性。

    private TestProperties _properties;
    public TestProperties Properties
    {
        get { return _properties; }
        set
        {
            _properties = value;
            this.bindingSource1.DataSource = _properties;
        }
    }

    public UserControl1()
    {
        InitializeComponent();
    }

在托管控件的父表单中,您有几个选项。

1)您可以直接绑定到 UserControl 公开的 TestProperties 类,就像在上面的示例中一样

2) 您可以重复用于在父控件上的用户控件上设置绑定的 BindingSource 练习,并将新 BindingSource(在父窗体上)的 DataSource 属性设置为等于 UserControl 的公开 TestProperties 属性。

于 2011-10-27T17:24:59.477 回答
0

像这样的东西是我能得到的最接近的东西:

在此处输入图像描述

我显然没有 groupbox 的代码(包括复选框),所以我尽我所能。

这是通过将其添加到顶部复选框来实现的:

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
   groupBox1.Enabled = ((CheckBox)(sender)).Checked;
}

我还重新启用了这一行:

this.checkBox1.DataBindings.Add("Checked", m_TP, "GroupChecked");
于 2011-10-27T16:51:51.890 回答