asp.net技巧点滴(一)

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asp.net技巧点滴(一)

1.使用快捷键

1<p>
2            <asp:Label ID="Label1" Runat="server" AccessKey="N"
3             AssociatedControlID="Textbox1">User<u>n</u>ame</asp:Label>
4            <asp:Textbox ID="TextBox1" Runat="server"></asp:Textbox></p>
5        <p>
6            <asp:Label ID="Label2" Runat="server" AccessKey="P"
7             AssociatedControlID="Textbox2"><u>P</u>assword</asp:Label>
8            <asp:Textbox ID="TextBox2" Runat="server"></asp:Textbox></p>
9        <p>
10            <asp:Button ID="Button1" Runat="server" Text="确定" />
11        </p>

使用 AssociatedControlID 属性将 Web 窗体上的一个 Label 控件与另一个服务器控件关联。当一个 Label 控件与另一个服务器控件相关联时，可以使用其属性扩展关联控件的功能。可以使用 Label 控件作为另一个控件的标题，或者可以设置关联控件的 Tab 键索引或热键

2.TextChanged 事件当用户更改 TextBox 的文本时发生。

1protected void TextBox1_TextChanged(object sender, EventArgs e)
2    {
3        Response.Write("更改");
4    }
5
6    protected void Button1_Click(object sender, EventArgs e)
7    {
8        Response.Write("没有更改");
9    }

3.使用Command触发事件

1<%@ Page Language="C#" %>
2
3<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4
5<script runat="server">
6    protected void Button_Command(Object sender,
7       System.Web.UI.WebControls.CommandEventArgs e)
8    {
9        switch (e.CommandName)
10        {
11            case ("DoSomething1"):
12                Response.Write("Button 1 was selected");
13                break;
14            case ("DoSomething2"):
15                Response.Write("Button 2 was selected");
16                break;
17        }
18    }
19</script>
20
21<html xmlns="http://www.w3.org/1999/xhtml" >
22<head id="Head1" runat="server">
23    <title>Buttons</title>
24</head>
25<body>
26    <form id="form1" runat="server">
27    <div>
28        <asp:Button ID="Button1" Runat="server" Text="Button 1"
29         OnCommand="Button_Command" CommandName="DoSomething1" />
30        <asp:Button ID="Button2" Runat="server" Text="Button 2"
31         OnCommand="Button_Command" CommandName="DoSomething2" />
32    </div>
33    </form>
34</body>
35</html>

4.使用OnClientClick事件,返回客户端脚本

1<%@ Page Language="C#" %>
2
3<script runat="server">
4    protected void Button1_Click(object sender, EventArgs e)
5    {
6        Response.Write("Postback!");
7    }
8</script>
9
10<script language="javascript" type="text/javascript">
11   function AlertHello()
12   {
13      alert('Hello ASP.NET');
14   }
15</script>
16
17<html xmlns="http://www.w3.org/1999/xhtml" >
18<head id="Head1" runat="server">
19    <title>Button Server Control</title>
20</head>
21<body>
22    <form id="form1" runat="server">
23        <asp:Button ID="Button1" Runat="server" Text="Button"
24         OnClientClick="AlertHello()" OnClick="Button1_Click" />
25    </form>
26</body>
27</html>
28

5.使用控件数据绑定数组

1<%@ Page Language="C#" %>
2
3<script runat="server">
4    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
5    {
6        string[] CarArray = new string[4] {"Ford", "Honda", "BMW", "Dodge"};
7        string[] AirplaneArray = new string[3] {"Boeing 777", "Boeing 747",
8           "Boeing 737"};
9        string[] TrainArray = new string[3] {"Bullet Train", "Amtrack", "Tram"};
10
11        if (DropDownList1.SelectedValue == "Car") {
12            DropDownList2.DataSource = CarArray; }
13        else if (DropDownList1.SelectedValue == "Airplane") {
14            DropDownList2.DataSource = AirplaneArray; }
15        else {
16            DropDownList2.DataSource = TrainArray;
17        }
18
19        DropDownList2.DataBind();
20        DropDownList2.Visible = true;
21    }
22
23    protected void Button1_Click(object sender, EventArgs e)
24    {
25        Response.Write("You selected <b>" +
26           DropDownList1.SelectedValue.ToString() + ": " +
27           DropDownList2.SelectedValue.ToString() + "</b>");
28    }
29</script>
30
31
32<html xmlns="http://www.w3.org/1999/xhtml" >
33<head id="Head1" runat="server">
34    <title>DropDownList Page</title>
35</head>
36<body>
37    <form id="form1" runat="server">
38    <div>
39        Select transportation type:<br />
40        <asp:DropDownList ID="DropDownList1" Runat="server"
41         OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"
42         AutoPostBack="true">
43            <asp:ListItem>Select an Item</asp:ListItem>
44            <asp:ListItem>Car</asp:ListItem>
45            <asp:ListItem>Airplane</asp:ListItem>
46            <asp:ListItem>Train</asp:ListItem>
47        </asp:DropDownList> 
48        <asp:DropDownList ID="DropDownList2" Runat="server" Visible="false">
49        </asp:DropDownList>
50        <asp:Button ID="Button1" Runat="server" Text="Select Options"
51         OnClick="Button1_Click" />
52    </div>
53    </form>
54</body>
55</html>
56

6.使用ListItem.Enabled 禁用列表项

1<%@ Page Language="C#" %>
2
3<script runat="server">
4
5    protected void Dropdownlist1_SelectedIndexChanged(object sender, EventArgs e)
6    {
7        Response.Write("You selected item number " +
8  DropDownList1.SelectedValue + "<br>");
9        Response.Write("You didn't select item number " +
10          DropDownList1.Items[1].Value);
11    }
12</script>
13
14<html>
15<head id="Head1" runat="server">
16    <title>DropDownList Server Control</title>
17</head>
18<body>
19    <form id="form1" runat="server">
20        <asp:DropDownList ID="DropDownList1" Runat="server" AutoPostBack="True" OnSelectedIndexChanged="Dropdownlist1_SelectedIndexChanged">
21            <asp:ListItem Value="1">First Choice</asp:ListItem>
22            <asp:ListItem Value="2" Enabled="False">Second Choice</asp:ListItem>
23            <asp:ListItem Value="3">Third Choice</asp:ListItem>
24        </asp:DropDownList>
25    </form>
26</body>
27</html>
28

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原文地址：https://www.cnblogs.com/Clingingboy/p/377631.html