Question

我应该更改后面的frmPersonnelVerified代码以从Session状态项中获取值。

这是我的会话状态代码：

public partial class frmPersonnel : System.Web.UI.Page 
{ 
    protected void btnSubmit_Click(object sender, EventArgs e) 
    { 
        try 
        { 
            //Checking validation for the text boxes 
            if (string.IsNullOrEmpty((txtFirstName.Text ?? string.Empty).Trim())) 
            { 
                txtFirstName.BackColor = System.Drawing.Color.Yellow; 
                lblError.Text += "Please enter first name! <br />"; 
            } 

            if (string.IsNullOrEmpty((txtLastName.Text ?? string.Empty).Trim())) 
            { 
                txtLastName.BackColor = System.Drawing.Color.Yellow; 
                lblError.Text += "Please enter last name! <br />"; 
            } 
            if (string.IsNullOrEmpty((txtPayRate.Text ?? string.Empty).Trim())) 
            { 
                txtPayRate.BackColor = System.Drawing.Color.Yellow; 
                lblError.Text += "Please enter pay rate! <br />"; 
            } 
            if (string.IsNullOrEmpty((txtStartDate.Text ?? string.Empty).Trim())) 
            { 
                txtStartDate.BackColor = System.Drawing.Color.Yellow; 
                lblError.Text += "Please enter start date! <br />"; 
            } 
            if (string.IsNullOrEmpty((txtEndDate.Text ?? string.Empty).Trim())) 
            { 
                txtEndDate.BackColor = System.Drawing.Color.Yellow; 
                lblError.Text += "Please enter end date! <br />"; 
            } 

            DateTime dt1; 
            DateTime dt2; 

            dt1 = DateTime.Parse(txtStartDate.Text); 
            dt2 = DateTime.Parse(txtEndDate.Text); 

            if (DateTime.Compare(dt1, dt2) > 0) 
            { 
                //Checking if the end date is greater than the start date 
                txtStartDate.BackColor = System.Drawing.Color.Yellow; 
                txtEndDate.BackColor = System.Drawing.Color.Yellow; 
                lblError.Text += "Start Date must not be greater than End Date! <br />"; 
            } 

            else 
            { 
                //output information if correct validation 
                Session["txtFirstName"] = txtFirstName.Text; 
                Session["txtLastName"] = txtLastName.Text; 
                Session["txtPayRate"] = txtPayRate.Text; 
                Session["txtStartDate"] = txtStartDate.Text; 
                Session["txtEndDate"] = txtEndDate.Text; 
                Server.Transfer("frmPersonalVerified.aspx"); 
            } 
        } 
        catch (Exception ex) 
        { 

        } 
    } 
}

我有一个提交按钮，当按下该按钮时，如果它正确验证，则应该将上述信息输入到另一页面上的文本框中。现在它不会这样做。

这是关于frmPersonnalVerified的代码：

public partial class frmPersonnelVerified : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        //Inputs information from frmPersonnel and places it into the  
        //textbox called "txtVerifiedInfo" 
        txtVerifiedInfo.Text = Request["txtFirstName"] + 
            "\n" + Request["txtLastName"] + 
            "\n" + Request["txtPayRate"] + 
            "\n" + Request["txtStartDate"] + 
            "\n" + Request["txtEndDate"]; 

    } 

}

Answer 1

您将变量存储在Session中，然后尝试通过Request对象访问它们。将其更改为Session，它应该可以工作：

public partial class frmPersonnelVerified : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        //Inputs information from frmPersonnel and places it into the  
        //textbox called "txtVerifiedInfo" 
        txtVerifiedInfo.Text = Session["txtFirstName"] + 
            "\n" + Session["txtLastName"] + 
            "\n" + Session["txtPayRate"] + 
            "\n" + Session["txtStartDate"] + 
            "\n" + Session["txtEndDate"]; 

    } 

}

但是，将值放入Session会有问题，所以要小心。

Answer 2

在经过验证的课程中，您试图从请求对象中获取值而不是会话对象。

Request对象将允许您访问回发的信息（例如表单字段）或部分查询字符串，并且名称建议与特定请求相关联。 Session对象与当前用户会话相关联，您可以在该对象中放置和检索任意对象。

作为旁注，因为这似乎与您的问题没有任何关系。很少需要访问ASP.NET中的Request对象，因为依赖ASP.NET的功能来构建基于请求数据的对象图通常是一种更好的解决方案。

代码中的

可能如下所示：

public partial class frmPersonnelVerified : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
        //Inputs information from frmPersonnel and places it into the  
        //textbox called "txtVerifiedInfo" 
        txtVerifiedInfo.Text = Session["txtFirstName"] + 
            "\n" + Session["txtLastName"] + 
            "\n" + Session["txtPayRate"] + 
            "\n" + Session["txtStartDate"] + 
            "\n" + Session["txtEndDate"]; 

    } 

}

Answer 3

这是处理事件的顺序：

Page_Load
btnSubmit_Click
Page_Render

如果您将代码从Page_Load移至Page_Render，则应该有效。

protected void Page_Render(object sender, EventArgs e) 
{ 
    //Inputs information from frmPersonnel and places it into the  
    //textbox called "txtVerifiedInfo" 
    txtVerifiedInfo.Text = Request["txtFirstName"] + 
        "\n" + Request["txtLastName"] + 
        "\n" + Request["txtPayRate"] + 
        "\n" + Request["txtStartDate"] + 
        "\n" + Request["txtEndDate"]; 
}

改变背后的代码

3 个答案: