Question

内容页面：

protected void Page_Load(object sender, EventArgs e)
{
    string gs = ConfigurationManager.ConnectionStrings["ging"].ConnectionString;
    if (Master.showCheck(s))
    {
        //do something...
    }
}

母版：

string gs = "";
protected void Page_Load(object sender, EventArgs e)
{
    gs = ConfigurationManager.ConnectionStrings["ging"].ConnectionString;
}
public bool showCheck(string strID)
{
    string strCheckIfParentExist = @"";

    using (SqlConnection scConn = new SqlConnection(gs))
    {
        scConn.Open(); //throws an error: 'The ConnectionString property has not been initialized'
    }
}

为什么会收到以下错误：The ConnectionString property has not been initialized

Answer 1

更改

protected void Page_Load(object sender, EventArgs e)
{
    string gs = ConfigurationManager.ConnectionStrings["ging"].ConnectionString;
}
public bool showCheck(string strID)
{
    string strCheckIfParentExist = @"";

    using (SqlConnection scConn = new SqlConnection(gs))
    {
        scConn.Open(); //throws an error: 'The ConnectionString property has not been initialized'
    }
}

要

private string gs = "";
protected void Page_Load(object sender, EventArgs e)
{
    gs = ConfigurationManager.ConnectionStrings["ging"].ConnectionString;
}
public bool showCheck(string strID)
{
    string strCheckIfParentExist = @"";

    using (SqlConnection scConn = new SqlConnection(gs))
    {
        scConn.Open(); //throws an error: 'The ConnectionString property has not been initialized'
    }
}

基本上，你的变量是以与你调用它的方式不同的方式声明的，所以你只需要将它的范围扩大到类。

Answer 2

如果你有＆＃34; gs＆＃34;作为类成员，将内容页面更改为

protected void Page_Load(object sender, EventArgs e)
{
    gs = ConfigurationManager.ConnectionStrings["ging"].ConnectionString;
    if (Master.showCheck(s))
    {
        //do something...
    }
}

字符串def你有类成员的影子。

为什么ConnectionString没有初始化错误

2 个答案: