asp.net控件的使用

最新推荐文章于 2023-12-27 17:39:41 发布

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最新推荐文章于 2023-12-27 17:39:41 发布

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本文链接：https://blog.youkuaiyun.com/henicolas/article/details/8154085

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Image1.ImageUrl = "~/img/Lucy.png";

textbox控件：用于输入；

label控件：用于显示信息；

上传控件FileUpload的使用：

 protected void btnUpload_Click(object sender, EventArgs e)
        {
            bool fileOK = false;
            string path = Server.MapPath("~/uploadimage/");
            if (FileUpload1.HasFile)
            { 
                string fileExtension=System.IO.Path.GetExtension(FileUpload1.FileName.ToLower());
                string[] allowedExtensions = { ".gif",".jpg",".png",".bmp"};
                foreach (string k in allowedExtensions)
                {
                    if (fileExtension == k)
                    {
                        fileOK = true;
                    }
                }

            }
            if (fileOK)
            {
                try
                {
                    FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                    info.Text = "文件上传成功！<br>" + "上传文件名为" + FileUpload1.PostedFile.FileName
                        + "<br>文件大小为:" + FileUpload1.PostedFile.ContentLength / 1024 + "KB" + "<br>文件的MIME类型为:" + FileUpload1.PostedFile.ContentType
                        ;


                }
                catch (Exception ex)
                {
                    info.Text = "文件上传失败，原因：" + ex.Message;

                }
            }
            else
            {
                info.Text = "不可接受的文件类型";
            }
        }

CompareValidator控件的使用(优先显示标签之间的内容，然后出错时才显示ErrorMessage)：

<HTML>
	<HEAD>
		<title>比较验证器</title>
		<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
		<meta name="CODE_LANGUAGE" Content="C#">
		<meta name="vs_defaultClientScript" content="JavaScript">
		<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
	</HEAD>
	<body MS_POSITIONING="GridLayout">
		<form id="CV1" method="post" runat="server">
			<asp:Label id="lblId" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 52px" runat="server"
				Width="80px" Height="22px">输入 ID：</asp:Label>
			<asp:TextBox id="txtId" style="Z-INDEX: 102; LEFT: 112px; POSITION: absolute; TOP: 52px" runat="server"
				Width="177px" Height="23px"></asp:TextBox>
			<asp:Label id="lblSdate" style="Z-INDEX: 103; LEFT: 8px; POSITION: absolute; TOP: 91px" runat="server"
				Width="80px" Height="27px">起始日期：</asp:Label>
			<asp:TextBox id="txtSdate" style="Z-INDEX: 104; LEFT: 112px; POSITION: absolute; TOP: 95px" runat="server"
				Width="176px" Height="22px"></asp:TextBox>
			<asp:Label id="lblEdate" style="Z-INDEX: 105; LEFT: 8px; POSITION: absolute; TOP: 129px" runat="server"
				Width="88px" Height="24px">截止日期：</asp:Label>
			<asp:TextBox id="txtEdate" style="Z-INDEX: 106; LEFT: 112px; POSITION: absolute; TOP: 133px"
				runat="server" Width="175px" Height="25px"></asp:TextBox>
			<asp:Button id="btnSubmit" style="Z-INDEX: 107; LEFT: 112px; POSITION: absolute; TOP: 176px"
				runat="server" Width="88px" Height="31px" Text="提交"></asp:Button>
			<asp:Label id="lblMessage" style="Z-INDEX: 108; LEFT: 8px; POSITION: absolute; TOP: 232px"
				runat="server" Width="292px" Height="33px"></asp:Label>
			<asp:CompareValidator id="ComVal1" style="Z-INDEX: 109; LEFT: 320px; POSITION: absolute; TOP: 57px" runat="server"
				Width="242px" Height="22px" ErrorMessage="ID 无效" ControlToValidate="txtId" Display="Dynamic" Operator="DataTypeCheck"
				Type="Integer">ID不对吧</asp:CompareValidator>
			<asp:CompareValidator id="ComVal2" style="Z-INDEX: 110; LEFT: 320px; POSITION: absolute; TOP: 99px" runat="server"
				Width="139px" Height="24px" ErrorMessage="日期无效" ControlToValidate="txtSdate" Operator="DataTypeCheck"
				Type="Date">日期不对吧</asp:CompareValidator>
			<asp:CompareValidator id="ComVal3" 
                style="Z-INDEX: 111; LEFT: 320px; POSITION: absolute; TOP: 132px" runat="server"
				Width="233px" Height="20px" ErrorMessage="截止日期应迟于起始日期！！" ControlToValidate="txtEdate" ControlToCompare="txtSdate"
				Display="Dynamic" Operator="GreaterThan" Type="Date" BorderStyle="Inset"></asp:CompareValidator>
		</form>
	</body>
</HTML>

后台代码：

private void Button1_Click(object sender, System.EventArgs e)
		{
			if (ComVal1.IsValid && ComVal2.IsValid && ComVal3.IsValid) 
				{
					lblMessage.Text  = "恭喜！！";
				}
				else 
					lblMessage.Text ="";
			}

CompareValidator的属性：	CustomVlidator控件的属性

customvalidator控件使用：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label">请输入系统密码：</asp:Label>
        <asp:TextBox ID="txtPWD" runat="server"></asp:TextBox><asp:CustomValidator ID="CustomValidator1"
            runat="server" ErrorMessage="密码不正确哦" ControlToValidate="txtPWD" 
            onservervalidate="CustomValidator1_ServerValidate"></asp:CustomValidator>
    </div>
    <asp:Button ID="Button1" runat="server" Height="21px" onclick="Button1_Click" 
        style="margin-left: 118px" Text="登录" Width="121px" />
        <br /><asp:Label ID="Label2" runat="server"
            Text="Label"></asp:Label>
    </form>
</body>
</html>

后台代码：

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
        {
           string  strval = args.Value.ToLower();
           if (strval.Equals("admin"))
           {
               args.IsValid = true;
           }
           else
               args.IsValid = false;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            if (CustomValidator1.IsValid)
            {
                Label2.Text = "恭喜登录成功！";
            }
            else {
                Label2.Text = "登录失败";
            }
        }

RegularExpressionValidator控件使用：

输出照片流，绘制图片：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;

namespace Asp.NetTeaPro2012.ch05.experiment
{
    public partial class writeImage : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           Response.ContentType = "Image/JPEG"; //"text/html";

            using (Bitmap bitmap = new Bitmap(500, 400))
            {

                using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
                {
                    //......
                   // g.
                 
                    g.DrawString("IP地址是：" + Request.UserHostAddress, new System.Drawing.Font("宋体", 20), System.Drawing.Brushes.Chocolate, 0, 0);

                    g.DrawString("操作系统：" + Context.Request.Browser.Platform, new System.Drawing.Font("宋体", 20), System.Drawing.Brushes.Red, 0, 50);

                    g.DrawString("浏览器信息：" + Context.Request.Browser.Type, new System.Drawing.Font("宋体", 20), System.Drawing.Brushes.Red, 0, 100);
                    g.DrawString(":"+Request.CurrentExecutionFilePath,new System.Drawing.Font("Arial",40),System.Drawing.Brushes.Cyan,50,150);
                }

                bitmap.Save(Context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
          
            }
           

        }
    }
}

绘制出来的图片：

水印例子代码：

 Context.Response.ContentType = "Image/JPEG";

            string name = Request["Name"];

            string fullPath = Request.MapPath("dd.jpg");

            using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(fullPath))
            {
                int x = bitmap.Width/4;
                int y = bitmap.Height-50;

                using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
                {

                    g.DrawString(name, new System.Drawing.Font("宋体", 40), System.Drawing.Brushes.SkyBlue, x, y);

                }

                bitmap.Save(Context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

            }

如果传入的Name=nicolas的话http://localhost:1043/receiveName.aspx?Name=nicolas