在基于 Web 的 ASP.NET 建议框程序中，管理员将能够使用所有者的用户名查看 GridView 控件中列出的所有建议。在 GridView 的最后一列中，将在此处列出状态。当管理员单击其中一个建议的状态时，将出现一个新的弹出窗口 (asp.net ajax ModalPopUpExtender)，其中列出所有可能的状态，例如：已执行、已批准...等。当管理员选择其中一种状态，建议的状态将在数据库中更新。一切正常。我现在要做的是，当用户更新任何建议的状态时，将向所有者发送一封电子邮件通知，告知其建议状态的更新。
我已经编写了 Mail 函数，但我不知道为什么它不发送任何电子邮件，并且在调试代码时出现此错误：
使用未分配的局部变量“描述”
我已经将它分配给数据库中 [Description] 列的值，但我不知道为什么会出现此错误。
谁能帮我解决这个问题？
我真的很难获得更新建议的用户名。仅供参考，我有以下数据库设计：
Employee Table: Username, Name...
SafetySuggestionsLog: ID, Title, Description, Username, StatusID
SafetySuggestionsStatus: ID, Status
ASP.NET 代码：
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ID"
width="900px" CssClass="mGrid"
DataSourceID="SqlDataSource1"
OnRowDataBound="GridView1_RowDataBound">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" CssClass="alt" />
<HeaderStyle Font-Bold = "True" ForeColor="Black" Height="20px"/>
<Columns>
<asp:BoundField DataField="ID" HeaderText="No." InsertVisible="False"
ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="Title" HeaderText="Title" SortExpression="Title" />
<asp:BoundField DataField="Description" HeaderText="Description"
SortExpression="Description" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Username" HeaderText="Username"
SortExpression="Username" />
<asp:BoundField DataField="DivisionShortcut" HeaderText="Division"
SortExpression="DivisionShortcut" />
<asp:BoundField DataField="Type" HeaderText="Type" SortExpression="Type" />
<%-- This to make status be opened and edited through the Ajax ModalPopUp Window --%>
<asp:TemplateField HeaderText="Status">
<ItemTemplate>
<asp:LinkButton runat="server" ID="lnkSuggestionStatus" Text='<%#Eval("Status")%>'
OnClick="lnkSuggestionStatus_Click">
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<%--<asp:HyperLinkField HeaderText="Status"
SortExpression="Status" />--%>
</Columns>
<RowStyle HorizontalAlign="Center" />
</asp:GridView>
<asp:Button runat="server" ID="btnModalPopUp" style="display:none" />
<AjaxToolkit:ModalPopUpExtender ID="modalPopUpExtender1"
runat="server"
TargetControlID="btnModalPopUp"
PopupControlID="pnlPopUp"
BackgroundCssClass="popUpStyle"
PopupDragHandleControlID="panelDragHandle"
OkControlID="OKButton">
</AjaxToolkit:ModalPopUpExtender>
<asp:HiddenField ID="HiddenField1" runat="server"/>
<asp:Panel runat="server" ID="pnlPopUp" CssClass="popUpStyle">
<asp:RadioButtonList ID="StatusList" runat="server" RepeatColumns="1" RepeatDirection="Vertical"
RepeatLayout="Table" TextAlign="Right" DataSourceID="SuggestionStatusDataSource"
DataTextField="Status" DataValueField="ID">
<asp:ListItem id="option1" runat="server" Value="ACTIONED" />
<asp:ListItem id="option2" runat="server" Value="APPROVED" />
<asp:ListItem id="option3" runat="server" Value="PENDING" />
<asp:ListItem id="option4" runat="server" Value="TRANSFERRED" />
</asp:RadioButtonList>
<asp:SqlDataSource ID="SuggestionStatusDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
SelectCommand="SELECT * FROM [SafetySuggestionsStatus]"></asp:SqlDataSource>
<asp:Button ID="confirmButton" runat="server" Text="Confirm"
OnClientClick="javascript:return confirm('Are you sure you want to send an email notification about the safety suggestion to the owner?')"
OnClick="btnSendStatus_Click" />
<asp:Button ID="OKButton" runat="server" Text="Close" />
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
代码隐藏：
protected void lnkSuggestionStatus_Click(object sender, EventArgs e)
{
LinkButton lnkSuggestionStatus = sender as LinkButton;
//var safetySuggestionsId =
//get reference to the row selected
GridViewRow gvrow = (GridViewRow)lnkSuggestionStatus.NamingContainer;
//set the selected index to the selected row so that the selected row will be highlighted
GridView1.SelectedIndex = gvrow.RowIndex;
//This HiddenField used to store the value of the ID
HiddenField1.Value = GridView1.DataKeys[gvrow.RowIndex].Value.ToString();
//ViewState["Username"] = gvrow.Cells[4].Text;
//show the modalPopUp
modalPopUpExtender1.Show();
}
public void btnSendStatus_Click(object sender, EventArgs e) {
//get the ID of the selected suggestion/row
var statusID = StatusList.SelectedValue;
var safetySuggestionsID = HiddenField1.Value;
string connString = "Data Source=localhost\\sqlexpress;Initial Catalog=psspdbTest;Integrated Security=True";
//For updating the status of the safety suggestion
string updateCommand = "UPDATE SafetySuggestionsLog SET StatusID= @statusID where ID=@SafetySuggestionsID";
using (SqlConnection conn = new SqlConnection(connString))
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(updateCommand, conn))
{
cmd.Parameters.AddWithValue("@statusID", Convert.ToInt32(statusID));
cmd.Parameters.AddWithValue("@SafetySuggestionsID", Convert.ToInt32(HiddenField1.Value));
cmd.ExecuteNonQuery();
}
//reset the value of hiddenfield
HiddenField1.Value = "-1";
}
GridView1.DataBind();
SendSuggestionStatusToUser(safetySuggestionsID);
}
protected void SendStatusByEmail(string toAddresses, string fromAddress, string MailSubject, string MessageBody, bool isBodyHtml)
{
SmtpClient sc = new SmtpClient("MAIL.Aramco.com");
try
{
MailMessage msg = new MailMessage();
msg.From = new MailAddress("pssp@aramco.com", "PMOD Safety Services Portal (PSSP)");
// In case the mail system doesn't like no to recipients. This could be removed
//msg.To.Add("pssp@aramco.com");
msg.Bcc.Add(toAddresses);
msg.Subject = MailSubject;
msg.Body = MessageBody;
msg.IsBodyHtml = isBodyHtml;
sc.Send(msg);
}
catch (Exception ex)
{
throw ex;
}
}
protected void SendSuggestionStatusToUser(string suggestionID)
{
string connString = "Data Source=localhost\\sqlexpress;Initial Catalog=psspdbTest;Integrated Security=True";
string safetySuggestionID = suggestionID.ToString();
//string username = ViewState["Username"].ToString();
//The following connection is to get the username of the suggestion Owner
//and append (@aramco.com) to it.
using (SqlConnection conn = new SqlConnection(connString))
{
var sbEmailAddresses = new System.Text.StringBuilder(2000);
//initiate the varibles that will be retreived from the database
string username;
string description;
string status;
// Open DB connection.
conn.Open();
string cmdText2 = @"SELECT Username, Description, Status FROM dbo.SafetySuggestionsLog SSL INNER JOIN SafetySuggestionsStatus SSS
ON (SSL.StatusID = SSS.ID) WHERE (SSL.ID = @safetySuggestionID)";
using (SqlCommand cmd = new SqlCommand(cmdText2, conn))
{
cmd.Parameters.AddWithValue("@SafetySuggestionID", Convert.ToInt32(HiddenField1.Value));
SqlDataReader reader = cmd.ExecuteReader();
if (reader != null)
{
if (reader.Read())
{
username = reader["Username"].ToString();
description = reader["Description"].ToString();
status = reader["Status"].ToString();
sbEmailAddresses.Append(username).Append("aramco.com");
}
}
var sEMailAddresses = sbEmailAddresses.ToString();
string body = @"Good day, <br /><br />
<b> We just would like to notify you that your following safety suggestion: </b>"
+ description +
@"<br /><br />
has been.
<br /> <br /><br /> <br />
This email was generated using the <a href='http://pmv/pssp/Default.aspx'>PMOD Safety Services Portal (PSSP) </a>.
Please do not reply to this email.
";
SendStatusByEmail(sbEmailAddresses.ToString(), "", "Notification of Your Safety Suggestion", body, true);
sbEmailAddresses.Clear();
reader.Close();
}
conn.Close();
}
}
注意：我知道我不应该在这里发布冗长的代码，而是因为我想向您解释我的工作并获得您的帮助。
更新：
我修改了关于将变量分配给 NULL 的代码，当我调试代码时，我发现阅读器不起作用并且它没有读取以下内容：
if (reader != null)
{
if (reader.Read())
{
username = reader["Username"].ToString();
description = reader["Description"].ToString();
status = reader["Status"].ToString();
sbEmailAddresses.Append(username).Append("@aramco.com");
}
}
更新 2：
在该SendSuggestionStatusToUser(string suggestionID)方法中，我在以下行中添加了断点：
string safetySuggestionID = suggestionID.ToString();
我在以下行中添加了断点：
cmd.Parameters.AddWithValue("@safetySuggestionID", Convert.ToInt32(HiddenField1.Value));
我发现对于第一个，safetySuggestionID 从传递的值中获取数据。但是，对于第二个，值为(HiddenField1.Value)-1，我不知道为什么。此外，我为以下每一行添加了断点：
SqlDataReader reader = cmd.ExecuteReader();
if (reader != null)
{
if (reader.Read())
{
username = reader["Username"].ToString();
description = reader["Description"].ToString();
status = reader["Status"].ToString();
sbEmailAddresses.Append(username).Append("@aramco.com");
}
}
并且调试器在调试它们时没有经过它们。它直接转到
var sEMailAddresses = sbEmailAddresses.ToString();
我不知道为什么。任何的想法？请你帮助我好吗？