有时候我们需要将一些变量的值保留在aspx页面上,当页面回传的时候我们可以获得该变量值并加以应用。
如下图,页面上分别放置有四个控件:textbox1、button1、button2、lable1
textbox1用于用户输入时设置全局变量的值,lable1用于显示该全局变量的值:
现在点击Button2,在Lable1中显示变量
在textbox1中录入变量值,点button1设置好变量,点击button2输出
OK!实在是简单.主要利用到了ViewState实例,很多程序员习惯利用会话级变量Session,但对于单个的Page页面来说,用ViewState还是比较实在的。
代码如下:
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public partial class _Default : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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}
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/// <summary>
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/// property of page
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/// </summary>
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public string Name
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{
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get
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{
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if (ViewState["name"] == null)
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{
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return "Zhang Liang";
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}
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else
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{
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return ViewState["name"].ToString();
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}
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}
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set
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{
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ViewState["name"] = value;
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}
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}
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protected void Button1_Click(object sender, EventArgs e)
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{
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Name = TextBox1.Text;
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}
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protected void Button2_Click(object sender, EventArgs e)
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{
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Label1.Text = "变量值为:" + Name;
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}
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}
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