c# - 未将对象引用设置为行 if (!string.IsNullOrEmpty(tdcd.Text) && !string.IsNullOrEmpty(tdrcd.Text)) 处的对象实例

Question

 protected void EditButton_Click(object sender, EventArgs e)
    {

        TextBox tdcd = (TextBox)FormViewDiagnostic.FindControl("DIAG_COMPL_DATETextBox");
        TextBox tdrcd = (TextBox)FormViewDiagnostic.FindControl("DIAG_REVIEW_COMPL_DATETextBox");
        RadioButtonList rbl =(RadioButtonList)FormViewDiagnostic.FindControl("DIAG_LL_APPROVALRadioButtonList");
        TextBox tll = (TextBox)FormViewDiagnostic.FindControl("DIAG_LL_COMMENTSTextBox");

        //if (!"".Equals(tdcd) && !"".Equals(tdrcd))

        if (!string.IsNullOrEmpty(tdcd.Text) && !string.IsNullOrEmpty(tdrcd.Text))
        {

            //tdcd.Visible = true;
            //tdrcd.Visible = true;

            FormViewDiagnostic.FindControl("DIAG_LL_APPROVALRadioButtonList").Visible = true;
            FormViewDiagnostic.FindControl("DIAG_LL_COMMENTSTextBox").Visible = true;
        }
        else
        {
            //tdcd.Visible = false;
            //tdrcd.Visible = false;
            FormViewDiagnostic.FindControl("DIAG_LL_APPROVALRadioButtonList").Visible = false;
            FormViewDiagnostic.FindControl("DIAG_LL_COMMENTSTextBox").Visible = false;
        }
    }

未将对象引用设置为行中对象的实例

if (!string.IsNullOrEmpty(tdcd.Text) && !string.IsNullOrEmpty(tdrcd.Text))

Answer 1

您的 tdcd 或 tdrcd 为空。这就是您收到此异常的原因。您可以先检查它们是否为空。

if ((tdcd != null && tdrcd!=null) && (!string.IsNullOrEmpty(tdcd.Text) && !string.IsNullOrEmpty(tdrcd.Text)))