在c#中使局部变量值全局

本文关键字：变量值 全局 使局 | 更新日期: 2023-09-27 18:14:08

我有以下代码。在这段代码中，我能够通过使用eventHandling获得字符串值，如1,2,3等。我如何得到这个值现在并不重要。我现在需要的是能够在page_load事件之外访问这个字符串值，就像下面给出的函数myfun()一样。我怎样才能做到呢? 

protected void Page_Load(object sender, EventArgs e)
{
    hfm mymaster = (hfm)Page.Master;
    lcont lc = mymaster.getlcont();
    lc.myevent += delegate(string st)
     {
         //slbl.Text = st;
         string str =st;
      }
 }
   protectd void myfun()
   {
     //i want to access the string value "st" here.
   }

在c#中使局部变量值全局

我看到有两种方法:

1)作为参数传递:

protected void Page_Load(object sender, EventArgs e)
{
    hfm mymaster = (hfm)Page.Master;
    lcont lc = mymaster.getlcont();
    lc.myevent += delegate(string st)
     {
         //slbl.Text = st;
         string str =st;
         myfunc(str); // pass as param
      }
 }
 protectd void myfun(string str)  // see signature
 {
     //i want to access the string value "st" here.
 }
2)创建一个类变量: 
string classvariable;
protected void Page_Load(object sender, EventArgs e)
{
    hfm mymaster = (hfm)Page.Master;
    lcont lc = mymaster.getlcont();
    lc.myevent += delegate(string st)
     {
         //slbl.Text = st;
         string str =st;
         classvariable = str; // set it here
     }
}
protectd void myfun()
{
   //i want to access the string value "st" here. // get it here
}

根据我的经验，您只需在函数作用域之外声明您想要全局的变量。

IE: Whatever/where they are contains。

string st; // St is declared outside of their scopes
protected void Page_Load(object sender, EventArgs e)
{}
   protectd void myfun()
   {
   }

可以设置为public:

public—成员可以从任何地方访问。这是限制最少的可见性。默认情况下，枚举和接口是公开可见的

<visibility> <data type> <name> = <value>;

或

public string name = "John Doe";

将全局变量(或类?)放在Page_Load之前或class声明之后。

public partial class Index : System.Web.UI.Page
{
   private string str = "";
   protected void Page_Load(object sender, EventArgs e)
   {
      hfm mymaster = (hfm)Page.Master;
      lcont lc = mymaster.getlcont();
      lc.myevent += delegate(string st)
      {
          //slbl.Text = st;
         str =st;
      }
   }
   protectd void myfun()
   {
     //i want to access the string value "st" here.
     //value of st has been passed to str already in page_load.
     string newString = str;
   }
}

一个简单的改变就可以使它成为可能。声明STR为全局变量

public class Form1
{
     string str = "";//Globel declaration of variable
    protected void Page_Load(object sender, EventArgs e)
    {
    }
}
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