Asp.net 基础2（验证）

1，客户端验证：

JavaScript 脚本，

代码
<script language="javascript">
    //验证输入框的输入不能为空
    function CheckForm(){
        var ret=false;
        if(document.all["txtName"].value=="")
         document.all["name_erroe"].style.visibility="visible"; 
        else if(document.all["txtPassword"].value=="")
            document.all["password_error"].style.visibility="visible";
        else 
        ret=true;
        return ret;
    }
</script>

<form id="form1" runat="server" onsubmit="return CheckForm()">

仅仅是客户端验证，首先，客户端浏览器要支持脚本，但并非所有的浏览器都支持这种功能。其次，恶意用户可以很容易的破坏客户端脚本，从而提交不良数据

2,服务端验证 

2.1 RequiredFieldValidator 控件

代码
<head runat="server">
    <title>测试RequrieField</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Please input Name"
            ControlToValidate="txtName" InitialValue="" BackColor="Gray" Display="Dynamic">
        </asp:RequiredFieldValidator>
        <asp:Button ID="btnOk" runat="server" Text="确定" />
    </div>
    </form>
</body>
</html>

2.2 CompareValidator控件

代码
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="年龄："></asp:Label>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidator1"
         runat="server" ErrorMessage="年龄必须大于0！" ControlToValidate ="TextBox1" Operator="GreaterThan" Type="Integer" ValueToCompare="0"></asp:CompareValidator>
    </div>
    <asp:Button ID="Button1" runat="server" Text="确定" />
    </form>
</body>
</html>

 2.3 RangeValidator 控件

代码
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Label ID="lable" runat="server">百分数：</asp:Label>
        <asp:TextBox ID="txtRange" runat="server"></asp:TextBox>
        <asp:RangeValidator ID="RangeValidator1" 
        runat="server" ErrorMessage="百分数在：1-100之间！" ControlToValidate="txtRange" Type="Integer" MaximumValue="100" MinimumValue="1"></asp:RangeValidator>
        <asp:Button ID="Button1" runat="server" Text="Button" />
    </div>
    </form>
</body>
</html>

 2.4 RegularExpressionValidator 控件

代码
        <asp:TextBox ID="txtIp" runat="server"></asp:TextBox>
        <asp:Label ID="Label1" runat="server">数字输入：</asp:Label>
        <asp:RegularExpressionValidator ID="regular" runat="server"
         ErrorMessage="请输入数字！" ControlToValidate="txtIp" ValidationExpression="\d+"></asp:RegularExpressionValidator>
        <asp:Button ID="Button1" runat="server" Text="Button" />
    </div>
    </form>

2.5 CustomValidator 

代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CustomValidateForm.aspx.cs" Inherits="TestCodeBehind.CustomValidateForm" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script language="javascript" type="text/javascript">
<!--
    function CheckIsEven(source,args){
        if(args.Value%2==0)
            args.IsValid=true;
        else
            args.IsValid=false;
    }
-->
</script>
<script language="C#" runat="server">
    private void ValidIsEven(object source, ServerValidateEventArgs args)
    {
        int value=int.Parse(args.Value);
        if (value % 2 == 0)
            args.IsValid = true;
        else
            args.IsValid = false; 
    } 
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    <asp:Label ID="Label1" runat="server" Text="偶数："></asp:Label>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:CustomValidator ID="cutomer" runat="server"
     ControlToValidate="TextBox1" ClientValidationFunction="CheckIsEven" OnServerValidate="ValidIsEven" ErrorMessage="请输入偶数！"></asp:CustomValidator>
        <asp:Button ID="Button1" runat="server" Text="确定" />
    </form>
</body>
</html>
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原文地址：https://www.cnblogs.com/csharponworking/p/1732799.html