谁帮我修改下下面的代码,我只要生成的随机码是数字,不要字母:public partial class image : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//生成4位的验证码
string tmp = RndNum(4);
//HttpCookie a = new HttpCookie("ImageV", tmp);
Session["ImageV"]= tmp;
//Response.Cookies.Add(a);
this.ValidateCode(tmp);
}
private void ValidateCode(string VNum)
{
Bitmap Img = null;
Graphics g = null;
MemoryStream ms = null;
int gheight = VNum.Length * 12;
Img = new Bitmap(gheight, 25);
g = Graphics.FromImage(Img);
//背景颜色
g.Clear(Color.White);
//文字字体
Font f = new Font("Arial Black", 10);
//文字颜色
SolidBrush s = new SolidBrush(Color.Black);
g.DrawString(VNum, f, s, 3, 3);
ms = new MemoryStream();
Img.Save(ms, ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/Jpeg";
Response.BinaryWrite(ms.ToArray()); g.Dispose();
Img.Dispose();
Response.End();
} private string RndNum(int VcodeNum)
{
string Vchar = "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[] VcArray = Vchar.Split(new Char[] { ',' });
string VNum = "";
int temp = -1; Random rand = new Random(); for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
} int t = rand.Next(35);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
}
{
protected void Page_Load(object sender, EventArgs e)
{
//生成4位的验证码
string tmp = RndNum(4);
//HttpCookie a = new HttpCookie("ImageV", tmp);
Session["ImageV"]= tmp;
//Response.Cookies.Add(a);
this.ValidateCode(tmp);
}
private void ValidateCode(string VNum)
{
Bitmap Img = null;
Graphics g = null;
MemoryStream ms = null;
int gheight = VNum.Length * 12;
Img = new Bitmap(gheight, 25);
g = Graphics.FromImage(Img);
//背景颜色
g.Clear(Color.White);
//文字字体
Font f = new Font("Arial Black", 10);
//文字颜色
SolidBrush s = new SolidBrush(Color.Black);
g.DrawString(VNum, f, s, 3, 3);
ms = new MemoryStream();
Img.Save(ms, ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = "image/Jpeg";
Response.BinaryWrite(ms.ToArray()); g.Dispose();
Img.Dispose();
Response.End();
} private string RndNum(int VcodeNum)
{
string Vchar = "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[] VcArray = Vchar.Split(new Char[] { ',' });
string VNum = "";
int temp = -1; Random rand = new Random(); for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));
} int t = rand.Next(35);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
}
就是 我可不可以把 int t = rand.Next(35); 括弧里面的35改成9 是不是就可以了呢?
改成string Vchar = "0,1,2,3,4,5,6,7,8,9';
就OK了
//得到int_Count位随机数
public static string GetRandom(int int_Count)
{
string str_RV="1";
for (int i=0; i < int_Count; i++)
{
str_RV=str_RV+"0";
}
Random r = new Random();
str_RV = r.Next(int.Parse(str_RV)).ToString();
return str_RV;
}
直接用這個,非常不錯!