c# - 动态添加控件的正确方法

Question

CheckBox[] checkBoxArray = new CheckBox[lines.Count()];
CheckBox checkBox = new CheckBox();

int yLocation = 25;
int diff = 0;
int i = 0;
foreach(var line in lines)
{
    this.checkBox.Text = line;
    this.checkBox.Location = new System.Drawing.Point(90, yLocation + diff);
    this.checkBox.Size = new System.Drawing.Size(110, 30);
    checkBoxArray[i] = checkBox;
    i++;
    diff = diff + 30;
}

我调试了我的应用程序并且checkBoxArray（在循环之后）都是一样的。

第二个问题是如何将控件添加到 WinForm？

Answer 1

看起来您实际上正在使用一些名为 checkBox 的类级别成员，而不是本地范围的成员：

CheckBox[] checkBoxArray = new CheckBox[lines.Count()];

int yLocation = 25;
int diff = 0;
int i = 0;
foreach(var line in lines)
{
    CheckBox checkBox = new CheckBox();
    checkBox.Text = line;
    checkBox.Location = new System.Drawing.Point(90, yLocation + diff);
    checkBox.Size = new System.Drawing.Size(110, 30);
    checkBoxArray[i] = checkBox;
    i++;
    diff = diff + 30;
    Controls.Add(checkBox);  // Add checkbox to form
}

我不确定它的目的是什么checkBoxArray，但如果它只是为了让事情正常工作，你可以安全地摆脱它。

Answer 2

如果您不在CheckBox循环内创建新实例，那么您只是CheckBox一次又一次地覆盖相同的值。

foreach (var line in lines)
{
    // Create a new CheckBox
    var checkBox = new CheckBox();

    // Set its properties
    checkBox.Text = line;
    ...

    // Add it to the form's collection of controls
    this.Controls.Add(checkBox);

    // Adjust checkBox.Location depending on where you want it
    checkBox.Location = new Point(0, 0);
}

Answer 3

也许这对您有所帮助：http: //support.microsoft.com/kb/319266

this.Controls.Add(checkBox);