简易密码输入自定义控件示例 含自定义事件 可在调用窗口事件视图中看到事件名

public partial class MyCheckBox : UserControl

{

string text=string.Empty;

bool bAutoSrcoll=true;

Size sSize;

public MyCheckBox()

{

InitializeComponent();

textBox1.TextChanged +=new EventHandler(Right_Click);

}

[Description("文本框内输入的内容")]

public string MyText

{

get { return text; }

set

{

textBox1.Text = value;

text = value;

}

}

[Description("光标跟随编辑位置")]

public bool AutoSrcoll

{

get { return bAutoSrcoll; }

set

{

bAutoSrcoll = value;

}

}

// [Description("文本更改")]

public delegate void RTextChangedEventHandler(object sender, RTextChangedEventArgs e);//事件所需的委托

//当颜色改变时触发事件

public event RTextChangedEventHandler RTextChanged;//定义一个ColorChanged事件

protected virtual void OnTextChanged(RTextChangedEventArgs e)

{//事件触发方法

if (RTextChanged != null)

{//判断事件是否为空

RTextChanged(this, e);//触发事件

}

}

public class RTextChangedEventArgs : EventArgs

{

public string str;

public RTextChangedEventArgs()

{

str = "right";

}

}

private void Right_Click(object sender, EventArgs e)

{

RTextChanged(this, new RTextChangedEventArgs());

}

private void SetSign(int Position)

{

string temp = string.Empty;

for (int i = 0; i < textBox1.Text.Length; i++)

{

temp += @"*";

}

textBox1.Text = temp;

if (bAutoSrcoll == true)

{

textBox1.Select(Position + 1, 0);

}

else

{

textBox1.Select(textBox1.Text.Length, 0);

}

textBox1.ScrollToCaret();

}

private void textBox1_TextChanged(object sender, EventArgs e)

{

if (MyText.Length == textBox1.Text.Length) //显示回显

{

string tmp = textBox1.Text.Replace(@"*", "");

if (tmp.Trim().Length != 0)

{

SetSign(textBox1.Text.Length);

}

return;

}

//输入空，不需回显

if (string.IsNullOrEmpty(textBox1.Text) == true)

{

text = string.Empty;

return;

}

string input = textBox1.Text.Replace(@"*", "");

if (input == string.Empty)//输入*号，不需回显

{

text = text + @"*";

return;

}

else

{

int inputset = textBox1.Text.LastIndexOf(input);

if (inputset == text.Length)//追加

{

text += input;

}

else//插入

text = text.Insert(inputset, input);

SetSign(inputset);

}

}

}