我正在使用C＃创建一个ASP.NET应用程序，每次尝试使用SqlCommand执行SQL INSERT时，该命令都会执行两次。我实现了这篇文章中的内容（SQL Insert query is executed twice），但它仍然无济于事。
以下是代码：
protected void btn_Add_Click(object sender, EventArgs e)
{
error.InnerHtml = " ";
SqlConnection MyConn = new SqlConnection("Data Source=.\\SQLEXPRESS;"
+ "Initial Catalog=SIMON;"
+ "Persist Security Info=True;"
+ "User ID=username;Password=password");
string sqlStatement = @"INSERT INTO [Network_Equipment] "
+ "([Network_Equipment_Name], [Network_Equipment_Type_ID], [IP_Address], [FQDN], [NetBIOS_Name], [Building_ID], [Description])"
+ " VALUES "
+ "(@Network_Equipment_Name, @Network_Equipment_Type_ID, @IP_Address, @FQDN, @NetBIOS_Name, @Building_ID, @Description)";
SqlCommand sqlCmd = new SqlCommand(sqlStatement, MyConn);
sqlCmd.Connection = MyConn;
sqlCmd.Parameters.AddWithValue("@Network_Equipment_Name", ((in_Add_Equipment.Value == null) ? (object)DBNull.Value : (object)in_Add_Equipment.Value));
sqlCmd.Parameters.AddWithValue("@Network_Equipment_Type_ID", ((ddl_Equipment_Type.SelectedValue == null) ? (object)DBNull.Value : (object)ddl_Equipment_Type.SelectedValue));
sqlCmd.Parameters.AddWithValue("@IP_Address", ((in_IP_Address.Value == null) ? (object)DBNull.Value : (object)in_IP_Address.Value));
sqlCmd.Parameters.AddWithValue("@FQDN", ((in_FQDN.Value == null) ? (object)DBNull.Value : (object)in_FQDN.Value));
sqlCmd.Parameters.AddWithValue("@NetBIOS_Name", ((in_NetBIOS.Value == null) ? (object)DBNull.Value : (object)in_NetBIOS.Value));
sqlCmd.Parameters.AddWithValue("@Building_ID", ((ddl_Building.SelectedValue == null) ? (object)DBNull.Value : (object)ddl_Building.SelectedValue));
sqlCmd.Parameters.AddWithValue("@Description", ((ta_Description.Value == null) ? (object)DBNull.Value : (object)ta_Description.Value));
try
{
MyConn.Open();
}
catch (Exception er)
{
error.InnerHtml = er.ToString();
return;
}
try
{
sqlCmd.ExecuteNonQuery();
}
catch (Exception er)
{
error.InnerHtml = er.ToString();
return;
}
error.InnerHtml = "Successfully added: " + in_Add_Equipment.Value;
sqlCmd.Dispose();
sqlCmd = null;
MyConn.Close();
in_Add_Equipment.Value = "";
ddl_Equipment_Type.SelectedIndex = 0;
in_IP_Address.Value = "";
in_FQDN.Value = "";
in_NetBIOS.Value = "";
ddl_Building.SelectedIndex = 0;
ta_Description.Value = "";
GridView1.DataBind();
}
我在调试模式下运行它，sqlCmd.ExecuteNonQuery（）只调用一次，但我添加了两个相同的条目。
我错过了什么和/或做错了什么？
--------编辑--------
我使用了john ryan代码的修改版本，但它仍然添加了两次。
以下是与此相关的所有代码：
Equipment.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Equipment.aspx.cs" Inherits="SIMON.Equipment" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script language="javascript" type="text/javascript">
// disables the button specified and sets its style to a disabled "look".
function disableButtonOnClick(oButton, sButtonText, sCssClass) {
oButton.disabled = true; // set button to disabled so you can't click on it.
oButton.value = sButtonText; // change the text of the button.
oButton.setAttribute('className', sCssClass); // IE uses className for the css property.
oButton.setAttribute('class', sCssClass); // Firefox, Safari use class for the css property. (doesn't hurt to do both).
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<div id="error" runat="server"> </div>
<div>
<fieldset style="display: inline-block; padding: 5px; -moz-border-radius: 8px; border-radius: 8px;">
<legend style="text-decoration: underline;">[ Add Equipment ]</legend>
<table cellpadding="3px" style="border: 0px; width: 300px;">
<tbody>
<tr>
<td style="text-align: left;"><label for="in_Add_Equipment" style="white-space: nowrap;">Equipment Name</label></td>
<td style="text-align: right;"><input id="in_Add_Equipment" runat="server" size="20" /></td>
<td style="text-align: left;"><label for="ddl_Equipment_Type" style="white-space: nowrap;">Equipment Type</label></td>
<td style="text-align: right;">
<asp:DropDownList ID="ddl_Equipment_Type"
runat="server" DataSourceID="Network_Equipment_Type" DataTextField="Network_Equipment_Type"
DataValueField="Network_Equipment_Type_ID"></asp:DropDownList>
</td>
</tr>
<tr>
<td style="text-align: left;"><label for="in_IP_Address" style="white-space: nowrap;">IP Address</label></td>
<td style="text-align: right;"><input id="in_IP_Address" runat="server" size="20" class="OnlyNumeric" /></td>
<td style="text-align: left;"><label for="in_FQDN" title="Fully Qualified Domain Name" style="white-space: nowrap;">FQDN</label></td>
<td style="text-align: right;"><input id="in_FQDN" runat="server" size="20" /></td>
</tr>
<tr>
<td style="text-align: left;"><label for="in_NetBIOS" style="white-space: nowrap;">NetBIOS Name</label></td>
<td style="text-align: right;"><input id="in_NetBIOS" runat="server" size="20" /></td>
<td style="text-align: left;"><label for="ddl_Building" style="white-space: nowrap;">Building</label></td>
<td style="text-align: right;">
<asp:DropDownList ID="ddl_Building" runat="server"
DataSourceID="Buildings" DataTextField="Building_Name"
DataValueField="Building_ID"></asp:DropDownList>
</td>
</tr>
<tr>
<td style="text-align: left;"><label for="ta_Description" style="white-space: nowrap;">Description</label></td>
<td style="text-align: right;" colspan="3"><textarea id="ta_Description" runat="server" cols="50" rows="3"></textarea></td>
</tr>
<tr>
<td colspan="4" style="text-align: right;">
<asp:Button ID="btn_Add" Text="Add" CssClass="ui-state-default ui-corner-all" runat="server" OnClick="btn_Add_Click" />
</td>
</tr>
</tbody>
</table>
</fieldset>
</div>
</ContentTemplate>
</asp:UpdatePanel>
<p></p>
<fieldset style="display: inline-block; padding: 5px; -moz-border-radius: 8px; border-radius: 8px;">
<legend style="text-decoration: underline;">[ Update Equipment ]</legend>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:SIMON-Writer %>"
DeleteCommand="DELETE FROM [Network_Equipment] WHERE [Network_Equipment_ID] = @original_Network_Equipment_ID"
OldValuesParameterFormatString="original_{0}"
SelectCommand="SELECT * FROM [All_Network_Equipment-Simplified]"
UpdateCommand="UPDATE [Network_Equipment] SET [Network_Equipment_Name] = @Network_Equipment_Name, [Network_Equipment_Type_ID] = @Network_Equipment_Type_ID, [IP_Address] = @IP_Address, [FQDN] = @FQDN, [NetBIOS_Name] = @NetBIOS_Name, [Building_ID] = @Building_ID, [Description] = @Description, [Active] = @Active WHERE [Network_Equipment_ID] = @original_Network_Equipment_ID">
<DeleteParameters>
<asp:Parameter Name="original_Network_Equipment_ID" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="Network_Equipment_Name" Type="String" />
<asp:Parameter Name="Network_Equipment_Type_ID" Type="Int32" />
<asp:Parameter Name="IP_Address" Type="String" />
<asp:Parameter Name="FQDN" Type="String" />
<asp:Parameter Name="NetBIOS_Name" Type="String" />
<asp:Parameter Name="Building_ID" Type="Int32" />
<asp:Parameter Name="Description" Type="String" />
<asp:Parameter Name="Active" Type="Boolean" />
</InsertParameters>
<UpdateParameters>
<asp:Parameter Name="Network_Equipment_Name" Type="String" />
<asp:Parameter Name="Network_Equipment_Type_ID" Type="Int32" />
<asp:Parameter Name="IP_Address" Type="String" />
<asp:Parameter Name="FQDN" Type="String" />
<asp:Parameter Name="NetBIOS_Name" Type="String" />
<asp:Parameter Name="Building_ID" Type="Int32" />
<asp:Parameter Name="Description" Type="String" />
<asp:Parameter Name="Active" Type="Boolean" />
<asp:Parameter Name="original_Network_Equipment_ID" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
CellPadding="4" DataKeyNames="Network_Equipment_ID"
DataSourceID="SqlDataSource1" ForeColor="#333333" GridLines="None">
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
<Columns>
<asp:BoundField DataField="Network_Equipment_ID"
HeaderText="Network_Equipment_ID" ReadOnly="True"
SortExpression="Network_Equipment_ID" Visible="False" />
<asp:BoundField DataField="Network_Equipment_Name" HeaderText="Equipment Name" SortExpression="Network_Equipment_Name" />
<asp:BoundField DataField="Network_Equipment_Type_ID" HeaderText="Network_Equipment_Type_ID" SortExpression="Network_Equipment_Type_ID" Visible="False" />
<asp:TemplateField HeaderText="Equipment Type" SortExpression="Network_Equipment_Type">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server"
DataSourceID="Network_Equipment_Type" DataTextField="Network_Equipment_Type"
DataValueField="Network_Equipment_Type_ID"
SelectedValue='<%# Bind("Network_Equipment_Type_ID") %>'>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("Network_Equipment_Type") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="IP_Address" HeaderText="IP Address" SortExpression="IP_Address" />
<asp:BoundField DataField="FQDN" HeaderText="FQDN" SortExpression="FQDN" />
<asp:BoundField DataField="NetBIOS_Name" HeaderText="NetBIOS Name" SortExpression="NetBIOS_Name" />
<asp:BoundField DataField="Building_ID" HeaderText="Building_ID" SortExpression="Building_ID" Visible="False" />
<asp:TemplateField HeaderText="Building" SortExpression="Building_Name">
<EditItemTemplate>
<asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="Buildings"
DataTextField="Building_Name" DataValueField="Building_ID"
SelectedValue='<%# Bind("Building_ID") %>'>
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("Building_Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Description" SortExpression="Description">
<EditItemTemplate>
<asp:TextBox ID="TextBox3" runat="server" Height="50px" Text='<%# Bind("Description") %>' TextMode="MultiLine" Width="200px"></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("Description") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CheckBoxField DataField="Active" HeaderText="Active" SortExpression="Active" />
<asp:CommandField ShowEditButton="True" />
</Columns>
<EditRowStyle BackColor="#999999" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#E9E7E2" />
<SortedAscendingHeaderStyle BackColor="#506C8C" />
<SortedDescendingCellStyle BackColor="#FFFDF8" />
<SortedDescendingHeaderStyle BackColor="#6F8DAE" />
</asp:GridView>
<br />
<asp:SqlDataSource ID="Network_Equipment_Type" runat="server" ConnectionString="<%$ ConnectionStrings:SIMON-Reader %>"
SelectCommand="SELECT DISTINCT * FROM [Network_Equipment_Types] ORDER BY [Network_Equipment_Type]">
</asp:SqlDataSource>
<asp:SqlDataSource ID="Buildings" runat="server" ConnectionString="<%$ ConnectionStrings:SIMON-Reader %>"
SelectCommand="SELECT DISTINCT * FROM [Buildings] ORDER BY [Building_Name]">
</asp:SqlDataSource>
</ContentTemplate>
</asp:UpdatePanel>
</fieldset>
</div>
</form>
</body>
</html>
Equipment.aspx.cs
namespace SIMON
{
public partial class Equipment : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
PostBackOptions optionsSubmit = new PostBackOptions(btn_Add);
btn_Add.OnClientClick = "disableButtonOnClick(this, 'Please wait...', 'disabled_button ui-corner-all'); ";
btn_Add.OnClientClick += ClientScript.GetPostBackEventReference(optionsSubmit);
}
}
protected void btn_Add_Click(object sender, EventArgs e)
{
error.InnerHtml = " ";
SqlTransaction trans = null;
using (SqlConnection MyConn = new SqlConnection(ConfigurationManager.ConnectionStrings["SIMON-Writer"].ToString()))
{
MyConn.Open();
trans = MyConn.BeginTransaction();
string sqlStatement = "INSERT INTO [Network_Equipment] "
+ "([Network_Equipment_Name], [Network_Equipment_Type_ID], [IP_Address], [FQDN], [NetBIOS_Name], [Building_ID], [Description])"
+ " VALUES "
+ "(@Network_Equipment_Name, @Network_Equipment_Type_ID, @IP_Address, @FQDN, @NetBIOS_Name, @Building_ID, @Description)";
using (SqlCommand sqlCmd = new SqlCommand(sqlStatement, MyConn))
{
sqlCmd.Transaction = trans;
sqlCmd.Connection = MyConn;
sqlCmd.Parameters.AddWithValue("@Network_Equipment_Name", ((in_Add_Equipment.Value == null) ? (object)DBNull.Value : (object)in_Add_Equipment.Value));
sqlCmd.Parameters.AddWithValue("@Network_Equipment_Type_ID", ((ddl_Equipment_Type.SelectedValue == null) ? (object)DBNull.Value : (object)ddl_Equipment_Type.SelectedValue));
sqlCmd.Parameters.AddWithValue("@IP_Address", ((in_IP_Address.Value == null) ? (object)DBNull.Value : (object)in_IP_Address.Value));
sqlCmd.Parameters.AddWithValue("@FQDN", ((in_FQDN.Value == null) ? (object)DBNull.Value : (object)in_FQDN.Value));
sqlCmd.Parameters.AddWithValue("@NetBIOS_Name", ((in_NetBIOS.Value == null) ? (object)DBNull.Value : (object)in_NetBIOS.Value));
sqlCmd.Parameters.AddWithValue("@Building_ID", ((ddl_Building.SelectedValue == null) ? (object)DBNull.Value : (object)ddl_Building.SelectedValue));
sqlCmd.Parameters.AddWithValue("@Description", ((ta_Description.Value == null) ? (object)DBNull.Value : (object)ta_Description.Value));
try
{
sqlCmd.ExecuteNonQuery();
trans.Commit();
}
catch (Exception er)
{
error.InnerHtml = er.ToString();
return;
}
finally
{
MyConn.Close();
error.InnerHtml = "Successfully added: " + in_Add_Equipment.Value;
in_Add_Equipment.Value = "";
ddl_Equipment_Type.SelectedIndex = 0;
in_IP_Address.Value = "";
in_FQDN.Value = "";
in_NetBIOS.Value = "";
ddl_Building.SelectedIndex = 0;
ta_Description.Value = "";
GridView1.DataBind();
}
}
}
}
}
}
--------编辑2 --------
我已经跟踪了导致SQL语句的“双重执行”的原因到这段代码：
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
PostBackOptions optionsSubmit = new PostBackOptions(btn_Add);
btn_Add.OnClientClick = "disableButtonOnClick(this, 'Please wait...', 'disabled_button ui-corner-all'); ";
btn_Add.OnClientClick = ClientScript.GetPostBackEventReference(optionsSubmit);
}
}
当我发表评论时，信息会被添加一次，但按钮不会像我想要的那样被禁用。禁用该按钮可以防止人们不耐烦并多次单击该按钮。
建议？
这是我得到的：
ASPX
<asp:Button ID="btn_Add" Text="Add" CssClass="ui-state-default ui-corner-all" runat="server" OnClick="btn_Add_Click" />
aspx.cs
if (!Page.IsPostBack)
{
PostBackOptions optionsSubmit = new PostBackOptions(btn_Add);
btn_Add.OnClientClick = "disableButtonOnClick(this, 'Please wait...', 'disabled_button ui-corner-all'); ";
btn_Add.OnClientClick += ClientScript.GetPostBackEventReference(optionsSubmit);
}
执行两次SQL语句
ASPX
<asp:Button ID="btn_Add" Text="Add" CssClass="ui-state-default ui-corner-all" runat="server" />
aspx.cs
if (!Page.IsPostBack)
{
PostBackOptions optionsSubmit = new PostBackOptions(btn_Add);
btn_Add.OnClientClick = "disableButtonOnClick(this, 'Please wait...', 'disabled_button ui-corner-all'); ";
btn_Add.OnClientClick += ClientScript.GetPostBackEventReference(optionsSubmit);
}
以所需方式短暂更改“btn_Add”，但不执行“btn_Add_Click”的代码
ASPX
<asp:Button ID="btn_Add" Text="Add" CssClass="ui-state-default ui-corner-all" runat="server" OnClick="btn_Add_Click" />
aspx.cs
if (!Page.IsPostBack)
{
PostBackOptions optionsSubmit = new PostBackOptions(btn_Add);
btn_Add.OnClientClick = "disableButtonOnClick(this, 'Please wait...', 'disabled_button ui-corner-all'); ";
//btn_Add.OnClientClick += ClientScript.GetPostBackEventReference(optionsSubmit);
}
以所需的方式更改“btn_Add”，不执行“btn_Add_Click”的代码，并将整个页面刷新到Equipment.aspx（通常通过jquery .load事件将Equipment.aspx加载到div中）< / p>
答案 0 :(得分：3)
很少有建议......
连接字符串应存储在您的web.config文件中。
可以在整个过程中捕获每个步骤的异常，但使用“using”语句。这样您就不必担心处置对象了。
我建议将Global.asax文件添加到项目中并在那里捕获应用程序错误。在你的catch语句中，你可以放一行并说“抛出新的异常......”并传入你的特定异常，这样就很容易捕获并且你可以描述错误。然后我建议在Enterprise Library 5.0中设置Logging应用程序块。拥有像你这样的全局“错误”变量可能不是一个好主意。如果您想轻松学习企业库，请下载企业库实验室示例。
我不会在您的代码中直接使用SQL命令。我会使用存储过程，并在SQL服务器本身上完成SQL。如果您有变量，请在存储过程上设置参数。存储过程对Web应用程序更安全。使用Microsoft企业库中的数据库应用程序块甚至可能是个好主意。他们为您提供了所有这些代码，您只需要导入库并了解命令。它们可以为您处理所有性能问题。
如果使用using语句，则无需关闭连接或处置。我在代码中删除了它。
如果你抛出一个异常，就不需要“return”语句......下一个阻塞堆栈的方法是使用一个符合条件的catch语句（或finally语句）来捕获它。如果没有，那么Global.asax中的Application_Error将捕获它。确保在.NET框架中正确处理未处理的异常。 Microsoft打破了.NET 3.5未处理的异常架构，因此您必须添加自己的模块，或者切换回1.1架构。或者升级到.NET 4.0。
实际问题：您的点击事件可能会被调用两次，因为您正在使用处理程序并且您的＆lt; asp：按钮源标记中指定了“onclick”事件属性。在VB中，单词“Handles”将遵循事件方法。在C＃中，处理程序可以位于不同的位置，具有不同类型的语法。如果你有两个，它会被调用两次。
这是＃1： ＆LT; ASP：按钮 ID = “btn_Add” 文字=“添加” CssClass =“ui-state-default ui-corner-all” RUNAT = “服务器” OnClick =“btn_Add_Click” /＆gt;
这是＃2： btn_Add.OnClientClick = ClientScript.GetPostBackEventReference（optionsSubmit）;
如果您的控件上有onclick属性，则无需添加特殊代码（如OnClientClick或事件处理程序）。只需使用1或其他。
祝你好运！
error.InnerHtml = " ";
string connStr = "Data Source=.\\SQLEXPRESS;"
+ "Initial Catalog=SIMON;"
+ "Persist Security Info=True;"
+ "User ID=username;Password=password");
using (SqlConnection MyConn = new SqlConnection(connStr))
{
string sqlStatement = @"INSERT INTO [Network_Equipment] "
+ "([Network_Equipment_Name], [Network_Equipment_Type_ID], [IP_Address], [FQDN], [NetBIOS_Name], [Building_ID], [Description])"
+ " VALUES "
+ "(@Network_Equipment_Name, @Network_Equipment_Type_ID, @IP_Address, @FQDN, @NetBIOS_Name, @Building_ID, @Description)";
SqlCommand sqlCmd = new SqlCommand(sqlStatement, MyConn);
sqlCmd.Connection = MyConn;
sqlCmd.Parameters.AddWithValue("@Network_Equipment_Name", ((in_Add_Equipment.Value == null) ? (object)DBNull.Value : (object)in_Add_Equipment.Value));
sqlCmd.Parameters.AddWithValue("@Network_Equipment_Type_ID", ((ddl_Equipment_Type.SelectedValue == null) ? (object)DBNull.Value : (object)ddl_Equipment_Type.SelectedValue));
sqlCmd.Parameters.AddWithValue("@IP_Address", ((in_IP_Address.Value == null) ? (object)DBNull.Value : (object)in_IP_Address.Value));
sqlCmd.Parameters.AddWithValue("@FQDN", ((in_FQDN.Value == null) ? (object)DBNull.Value : (object)in_FQDN.Value));
sqlCmd.Parameters.AddWithValue("@NetBIOS_Name", ((in_NetBIOS.Value == null) ? (object)DBNull.Value : (object)in_NetBIOS.Value));
sqlCmd.Parameters.AddWithValue("@Building_ID", ((ddl_Building.SelectedValue == null) ? (object)DBNull.Value : (object)ddl_Building.SelectedValue));
sqlCmd.Parameters.AddWithValue("@Description", ((ta_Description.Value == null) ? (object)DBNull.Value : (object)ta_Description.Value));
try
{
MyConn.Open();
}
catch (Exception er)
{
//error.InnerHtml = er.ToString();
//return;
throw new Exception(...
}
try
{
sqlCmd.ExecuteNonQuery();
}
catch (Exception er)
{
//error.InnerHtml = er.ToString();
//return;
throw new Exception(...
}
error.InnerHtml = "Successfully added: " + in_Add_Equipment.Value;
}
in_Add_Equipment.Value = "";
ddl_Equipment_Type.SelectedIndex = 0;
in_IP_Address.Value = "";
in_FQDN.Value = "";
in_NetBIOS.Value = "";
ddl_Building.SelectedIndex = 0;
ta_Description.Value = "";
GridView1.DataBind();
答案 1 :(得分：1)
删除两次捕获中的“返回”
和
为每次尝试添加finally语句
并移动
sqlCmd.Dispose(); sqlCmd = null; MyConn.Close();
进入终于
调试时，可以看到insert语句是否正确。然后查看数据库。
答案 2 :(得分：0)
@Jesus Ramos是正确的。
做这样的事情。
private _constring = new SqlConnection("Data Source=.\\SQLEXPRESS;"
+ "Initial Catalog=SIMON;"
+ "Persist Security Info=True;"
+ "User ID=username;Password=password");
protected void btn_Add_Click(object sender, EventArgs e)
{
SqlTransaction trans = null;
using (var con = new SqlConnection(_constring))
{
con.Open();
trans = con.BeginTransaction();
using (
string sqlStatement ="//SqlStuff";
var sqlCmd = new SqlCommand(sqlStatement,con))
{
sqlCmd.Transaction = trans;
sqlCmd.Connection = con;
try
{
//sqlcmd.Parameters Stuff
sqlCmd.ExecuteNonQuery();
trans.Commit();
//SUCCESS
}
catch (Exception er)
{
error.InnerHtml = er.ToString();
return;
}
finally
{
con.Close();
}
}
}
}
此致
答案 3 :(得分：0)
除了在一个函数中使用太多代码，不使用using语句等之外，这个事件处理函数被多次调用的唯一原因是它是多次连接的。检查您的AutoEventWireUp设置，前面的代码以获取按钮上OnClick的定义，以及代码隐藏中的显式事件连接（可能看起来像btn_Add.Click += btn_Add_Click;。