Question

我有一个带有showForm按钮的form1，该按钮以编程方式创建并打开一个包含4个form2元素和DomainUpDown按钮的新OKBtn。我需要使用DomainUpDown OKBtn从form2到form1 richtextbox传递public void showForm_Click(object sender,EventArgs e) { Form frm = new Form(); frm.Size = new Size(264, 183); frm.Name = "MarginSelector"; frm.Text = "Qiymət ver"; frm.ShowIcon = false; frm.Show(); DomainUpDown marginRightVal = new DomainUpDown(); marginRightVal.Location = new Point(150, 100); marginRightVal.Size = new Size(42, 40); frm.Controls.Add(marginRightVal); for (int i = 0; i < 100; i++) { marginRightVal.Items.Add(i + "%"); } Button OKBtn = new Button(); OKBtn.Visible = true; OKBtn.Text = "OK"; OKBtn.Size = new Size(30, 23); OKBtn.Location = new Point(96, 109); frm.Controls.Add(OKBtn); OKBtn.Click += new System.EventHandler(this.OKBtn_Click); } public void OKBtn_Click(object sender, EventArgs e) { textArea.SelectionLength = 0; textArea.SelectedText = string.Filter("margin-top: {0} ; \n, ? "); }元素的值。我只有diffulty是最后的问号。以下是代码段：

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Answer 1

您可以关注Hans Passant他的建议，或者您可以将点击事件的sender投射到控件，获取对表单的引用并迭代Controls集合以找到您的控件＆＃ 39;重新寻找。找到后，将其分配给变量并在逻辑中使用它。实现可能如下所示：

public void OKBtn_Click(object sender, EventArgs e)
{
    // assume a Control is the sender
    var ctrl = (Control)sender;
    // on which form is the control?
    var frm = ctrl.FindForm();
    // iterate over all controls
    DomainUpDown domainUpDown = null;
    foreach(var ctr in frm.Controls)
    {
        // check if this is the correct control
        if (ctr is DomainUpDown)
        {
            // store it's reference
            domainUpDown = (DomainUpDown)ctr;
            break;
        }
    }
    // if we have found the control
    if (domainUpDown != null)
    {
        textArea.SelectionLength = 0;
        Debug.WriteLine(domainUpDown.SelectedIndex);
        Debug.WriteLine(domainUpDown.SelectedItem);
        // use the SelectedItem
        textArea.SelectedText = string.Format("margin-top: {0} ; \n,", domainUpDown.SelectedItem );
    }
}

如果表单上有多个控件，最好为每个控件添加一个唯一的名称：

DomainUpDown marginRightVal = new DomainUpDown();
marginRightVal.Location = new Point(150, 100);
marginRightVal.Size = new Size(42, 40);
marginRightVal.Name = "right";
frm.Controls.Add(marginRightVal);

当您遍历控件集合时，您可以检查该名称：

foreach(var ctr in frm.Controls)
{
    // check if this is the correct control
    if (ctr is DomainUpDown)
    {
        // store it's reference
        domainUpDown = (DomainUpDown)ctr;
        if (domainUpDown.Name == "right")
        {
           // do logic for that value
        }
    }
}

或者您可以使用Find method：

var found = frm.Controls.Find("right", false);
if (found.Length>0)
{
    var rightDomain = (DomainUpDown)found[0];
    // do logic here
}

将DomainUpDown.Value从编程生成的表单传递到主窗体

1 个答案: