如何从C＃中的不同方法访问变量？

Question

如何访问page_load上的变量并在c＃中使用ddlApp_SelectedIndexChanged方法？ 谢谢

private void Page_Load(object sender, EventArgs e) 
{ 
    if (!IsPostBack) 
    { 
     ddlRole.SelectedIndex = 0; 
    } 

    string ddl = ddlApp.Value.ToString(); 
    string ddlRoleDs; 
    string ddlMenuDs; 
    string GvDs; 

    if (ddl == "ATTD") 
    { 
     ddlRoleDs = "ddlAttdDs"; 
     ddlMenuDs = "ddlMenuAttdDs"; 
     GvDs = "AttdMenuAssignmentDs";     
    } 
    else if (ddl == "TRVL") 
    { 
     ddlRoleDs = "ddlTrvldDs"; 
     ddlMenuDs = "ddlMenuTrvlDs"; 
     GvDs = "TrvlMenuAssignmentDs";     
    } 

} 

变量：ddlRoleDs，GvDs和ddMenuDs

protected void ddlApp_SelectedIndexChanged(object sender, EventArgs e) 
{   
    ddlRole.DataSourceID = ddlRoleDs; 
    MenuAssignmentGv.DataSourceID = GvDs; 
    ddlMenu.DataSourceID = ddlMenuDs; 
} 

Answer 1

您可以在类中使用私有的全球成员。这样他们只能在课堂上进行访问。下面的代码显示你到底如何声明和使用它们

private string ddlRoleDs; 
private string GvDs; 
private string ddMenuDs; 

private void Page_Load(object sender, EventArgs e) 
{ 
    // don't declare them here, but you can use them here 
    ddlRoleDs = "test value"; 
    .... 
} 

的值在Page_Load方法设置后，就可以在你的另一种方法可以使用

protected void ddlApp_SelectedIndexChanged(object sender, EventArgs e) 
{   
    ddlRole.DataSourceID = ddlRoleDs; 
    MenuAssignmentGv.DataSourceID = GvDs; 
    ddlMenu.DataSourceID = ddlMenuDs; 
}