Question

嗨，我是c＃的新手，过去几天一直在研究这个项目。我发现其他问题与我的相似，但找不到解决方案。我有这个项目，其中有一个按钮（结束日操作）。单击该按钮会抛出nullReferenceException。

这是我的C＃代码：

 protected void EndDayOperationButton_Click(object sender, EventArgs e)
    {
        var date = Conversion.TryCastDate(BodEngDateTextBox.Text);
        var userId = UserId;
        var isAdmin = Common.Helpers.SessionHelper.IsAdmin();

        if (!isAdmin)
        {
            ReturnButton.Visible = true;
            EndDayOperationButton.Visible = true;
            ShowFailModal("< b > Authorization Failed!</ b > < br /> Contact your system admin to perform day operation.");
            return;
        }

        if (!BusinessLayer.Security.Login.IsBoDStarted(date))
        {
            Response.Redirect("~/Utilities/BodOperation.aspx");
        }
        else
        {
            try
            {
                if (BusinessLayer.Utilities.DayOperation.EndDayOperation(date, OfficeId, userId))
                {
                    ReturnButton.Visible = true;
                    EndDayOperationButton.Visible = false;
                    ReturnButton.Visible = false;
                    ShowSuccessModal("<B>EOD Completed Successfully</B></br>You can now logout from the system.");
                }
                else
                {
                    ShowFailModal("<B>EOD Failed.</B></br>An unknown error occured during EOD operation.");
                }
            }
            catch (Exception Ex)
            {
                ShowFailModal("<B>EOD Failed.</B></br>" + Ex.Message);
            }
        }
    }

Page使用UserControl，这里有例外

 public Literal MessageLiteral => MessageLabel;

    public string Message
    {
        get { return MessageLabel.Text; }
        set {MessageLabel.Text = value; }
    }

堆栈追踪：

[NullReferenceException：对象引用未设置为的实例一个东西。] Everest.Net.Web.UserControls.MaskDialogControl.set_Message（字符串价值） d：\珠峰\ Everest.Net.Web \用户控件\ MaskDialogControl.ascx.cs：24 Everest.Net.Web.BaseObjects.EverestWebPage.ShowModal（String message）in d：\珠峰\ Everest.Net.Web \ BaseObjects \ EverestWebPage.cs：82 Everest.Net.Web.BaseObjects.EverestWebPage.ShowFailModal（String message）in d：\珠峰\ Everest.Net.Web \ BaseObjects \ EverestWebPage.cs：103 Everest.Net.Web.Utilities.EodOperation.EndDayOperationButton_Click（对象发件人，EventArgs e）in d：\珠峰\ Everest.Net.Web \公用\ EodOperation.aspx.cs：71 System.Web.UI.WebControls.Button.OnClick（EventArgs e）+11756692 System.Web.UI.WebControls.Button.RaisePostBackEvent（String eventArgument）+149 System.Web.UI.Page.ProcessRequestMain（Boolean includeStagesBeforeAsyncPoint，Boolean includeStagesAfterAsyncPoint） 3359

按钮单击抛出nullReference异常

0 个答案: