一些常用的方法

1、Form窗口

1.1、获取当前控件属性 sender.GetType().Name

1.2、取到DataGridView中的行 DataGridViewCellEventArgs e

取到鼠标所在表中的行 e.RowIndex

1.3、随机字符串的方法

/// <summary>
/// '产生随机字符串
/// </summary>
/// <param name="num">随机出几个字符</param>
/// <returns>随机出的字符串</returns>
private string GenCode(int num)
{
//string str = "的一是严";
string str = "abcde12345";//便于输入启用字母数字组合
char[] chastr = str.ToCharArray();
//string[] source ={ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "#", "$", "%", "&", "@" };
string code = "";
Random rd = new Random();
int i;
for (i = 0; i < num; i++)
{
//code += source[rd.Next(0, source.Length)];
code += str.Substring(rd.Next(0, str.Length), 1);
}
Session["CheckCode"] = code;

return code;

}

1.4、画图

/// <summary>
/// 生成图片（增加背景噪音线、前景噪音点）
/// </summary>
/// <param name="checkCode">随机出字符串</param>
private void CodeImage(string checkCode)
{
if (checkCode.Trim() == "" || checkCode == null)
return;
Session["Code"] = checkCode; //将字符串保存到Session中，以便需要时进行验证
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)(checkCode.Length * 12), 22);//汉字使用22，字母使用12
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();

//清空图片背景色
g.Clear(Color.White);

// 画图片的背景噪音线
int i;
for (i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}

Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Brown, Color.Black, 1.2F, true);
g.DrawString(checkCode, font, brush, 2, 2);

//画图片的前景噪音点
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());

}
catch
{
g.Dispose();
image.Dispose();
}

}

1.5、页面代码

<td class="a2">
<asp:TextBox ID="CheckCodeInput" runat="server" CssClass="input_val"></asp:TextBox>
<script language="javascript" type="text/javascript">
document.write(" <img   id='verifyCodePic'  src='ImageR.aspx?temp= " + Math.random() + "' onclick='changeVerifycode()'> ");
</script>
</td>

function changeVerifycode() {
document.getElementById("verifyCodePic").src = "ImageR.aspx?temp=" + Math.random();

}