得到这个错误无法理解这里的错误 plz help .. SqlDataSource sqlds =（SqlDataSource）e.Item.FindControl（SqlDataSource3）as SqlDataSource; 第86行： 第87行：sqlds.ConnectionString =数据源= DIMPLE;初始目录= torqbolt;集成安全性=真; 第88行：sqlds.SelectCommand =选择注释，rply_name，rpl_date，task_id来自rply where task_id ='+ lblID.Text +'; System.NullReferenceException：对象引用未设置为实例一个对象。
getting this error cant understand whats wrong here plz help .. SqlDataSource sqlds =(SqlDataSource) e.Item.FindControl("SqlDataSource3") as SqlDataSource; Line 86: Line 87: sqlds.ConnectionString = "Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True"; Line 88: sqlds.SelectCommand = "select comment,rply_name,rpl_date,task_id from rply where task_id ='" + lblID.Text + "'"; System.NullReferenceException: Object reference not set to an instance of an object.
<asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource2" OnItemCommand="ListView1_ItemCommand" OnItemDataBound="use" DataKeyNames="task_id"> <AlternatingItemTemplate><br> <div class="postback"> <span> <asp:Label ID="id_Label" runat="server" Text='<%# Eval("task_id") %>' /> <span class="heding_color">Assigned to </span> <asp:Label ID="post_nameLabel" runat="server" Text='<%# Eval("post_name") %>' /> <br /> <br /> <span class="heding_color">Description</span><br /> <asp:Label ID="messageLabel" runat="server" Text='<%# Eval("message") %>' /> <br /> <br /> <br /> <br /> <span class="heding_color">Posted by : </span> <asp:Label ID="asigntask_nameLabel" runat="server" Text='<%# Eval("asign_name") %>' /> <span class="asgndate "><span class="heding_color"> Posted On </span> <asp:Label ID="curnt_dateLabel" runat="server" Text='<%# Eval("curnt_date") %>' /></span><br /> <span id='<%# Eval("task_id") %>'> <asp:ListView id="rply" runat="server" DataSourceID="SqlDataSource3"> <ItemTemplate> <ul> <li> <asp:Label ID="task_id" runat="server" Text='<%# Eval("task_id") %>' /> <asp:Label ID="comment_Label" runat="server" Text='<%# Eval("comment") %>' /> <asp:Label ID="rply_name" runat="server" Text='<%# Eval("rply_name") %>' /> <asp:Label ID="date" runat="server" Text='<%# Eval("rpl_date") %>' /> </li> </ul> </ItemTemplate> </asp:ListView> <div class="cust_summary replaybtn">Replay</div> <div id="cust_details" class="cust_details" style="display:none; "> <br /> <asp:TextBox ID="TextBoxL" placeholder="Write Your Comment.." class="commentTextArea" runat="server" TextMode="MultiLine" Rows="2"></asp:TextBox><br /> <br /> <asp:Button ID="Button3" CommandName="insert" runat="server" class="btncomment" Text="Post" onclick="Button3_Click" /> </div> <br /> </span></span></div> </AlternatingItemTemplate> <ItemTemplate><br> <div class="postback"> <span> <asp:Label ID="id_Label" runat="server" Text='<%# Eval("task_id") %>'/> <span class="heding_color">Assigned to </span> <asp:Label ID="post_nameLabel" runat="server" Text='<%# Eval("post_name") %>' /> <br /><br /> <span class="heding_color">Description</span><br /> <asp:Label ID="messageLabel" runat="server" Text='<%# Eval("message") %>' /> <br /> <br /> <br /> <br /> <br /> <span class="heding_color"> Posted by : </span> <asp:Label ID="asign_nameLabel" runat="server" Text='<%# Eval("asign_name") %>' /> <span class="asgndate"><span class="heding_color"> Posted On </span> <asp:Label ID="curnt_dateLabel" runat="server" Text='<%# Eval("curnt_date") %>' /></span><br /><br /> <span id='<%# Eval("task_id") %>'> <asp:ListView id="rply" runat="server" DataSourceID="SqlDataSource3"> <ItemTemplate> <ul> <li> <asp:Label ID="task_id" runat="server" Text='<%# Eval("task_id") %>' /> <asp:Label ID="comment_Label" runat="server" Text='<%# Eval("comment") %>' /> <asp:Label ID="rply_name" runat="server" Text='<%# Eval("rply_name") %>' /> <asp:Label ID="date" runat="server" Text='<%# Eval("rpl_date") %>' /> </li> </ul> </ItemTemplate> </asp:ListView> <div class="cust_summary replaybtn">Replay</div> <div id="cust_details" class="cust_details" style="display:none; "><br /> <asp:TextBox ID="TextBoxL" Enabled="true" placeholder="Write Your Comment.." class="commentTextArea" runat="server" TextMode="MultiLine" Rows="2"></asp:TextBox><br /> <br /> <asp:Button ID="Button3" runat="server" class="btncomment" Text="Post" onclick="Button3_Click" /> </div> <br /> </span> </span></div> </ItemTemplate> <LayoutTemplate> <br> <div ID="itemPlaceholderContainer" runat="server"> <span runat="server" id="itemPlaceholder" /> </div> <div style=""> </div> </LayoutTemplate> <SelectedItemTemplate> <div class="postback"> <span > <asp:Label ID="id_Label" runat="server" Text='<%# Eval("task_id") %>'/> <span class="heding_color">Assigned to </span> <asp:Label ID="post_nameLabel" runat="server" Text='<%# Eval("post_name") %>' /> <br /> <span class="heding_color">Description</span><br /> <asp:Label ID="messageLabel" runat="server" Text='<%# Eval("message") %>' /> <br /> <br /> <br /> <span class="heding_color"> Posted by : </span> <asp:Label ID="asign_nameLabel" runat="server" Text='<%# Eval("asign_name") %>' /> <span class="asgndate"><span class="heding_color">Posted On </span> <asp:Label ID="curnt_dateLabel" runat="server" Text='<%# Eval("curnt_date") %>' /></span><br /><br /> <span id='<%# Eval("task_id") %>'> <asp:ListView id="rply" runat="server" DataSourceID="SqlDataSource3"> <ItemTemplate> <ul> <li> <div><%# Eval("task_id") %></div> <asp:Label ID="task_id" runat="server" Text='<%# Eval("task_id") %>' /> <asp:Label ID="comment_Label" runat="server" Text='<%# Eval("comment") %>' /> <asp:Label ID="rply_name" runat="server" Text='<%# Eval("rply_name") %>' /> <asp:Label ID="date" runat="server" Text='<%# Eval("rpl_date") %>' /> </li> </ul> </ItemTemplate> </asp:ListView> <div class="cust_summary replaybtn">Replay</div> <div id="cust_details" class="cust_details" style="display:none; "><br /> <asp:TextBox ID="TextBoxL" placeholder="Write Your Comment.." class="commentTextArea" runat="server" TextMode="MultiLine" Rows="2"></asp:TextBox><br /> <br /> <asp:Button ID="Button3" class="btncomment" runat="server" Text="Post" onclick="Button3_Click" /> </div> <br /> <br /> </span> </span></div> </SelectedItemTemplate> </asp:ListView> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ApplicationServices %>" SelectCommand="SELECT [name]FROM [names]"> </asp:SqlDataSource> <asp:SqlDataSource ID="SqlDataSource2" runat="server" > </asp:SqlDataSource> <asp:SqlDataSource ID="SqlDataSource3" runat="server" > </asp:SqlDataSource>
protected void Page_Load(object sender, EventArgs e) { SqlDataSource2.ConnectionString = "Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True"; SqlDataSource2.SelectCommand = "select task_id,message,post_name,curnt_date,asign_name from task"; // string s2 = System.Web.HttpContext.Current.User.Identity.Name; Session["name"] = s2; }
protected void use(object sender, ListViewItemEventArgs e) { Label d = (Label)e.Item.FindControl(\"id_Label\"); ViewState[\"task_id\"] = d.Text; // try // { Label lblID =(Label)e.Item.FindControl(\"id_Label\") as Label; SqlDataSource sqlds =(SqlDataSource) e.Item.FindControl(\"SqlDataSource3\") as SqlDataSource; sqlds.ConnectionString = \"Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True\"; sqlds.SelectCommand = \"select comment,rply_name,rpl_date,task_id from rply where task_id =’\" + lblID.Text + \"’\"; }
protected void use(object sender, ListViewItemEventArgs e) { Label d = (Label)e.Item.FindControl("id_Label"); ViewState["task_id"] = d.Text; // try // { Label lblID =(Label)e.Item.FindControl("id_Label") as Label; SqlDataSource sqlds =(SqlDataSource) e.Item.FindControl("SqlDataSource3") as SqlDataSource; sqlds.ConnectionString = "Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True"; sqlds.SelectCommand = "select comment,rply_name,rpl_date,task_id from rply where task_id ='" + lblID.Text + "'"; }
推荐答案 ConnectionStrings:ApplicationServices %>\" SelectCommand=\"SELECT [name]FROM [names]\"> </asp:SqlDataSource> <asp:SqlDataSource ID=\"SqlDataSource2\" runat=\"server\" > </asp:SqlDataSource> <asp:SqlDataSource ID=\"SqlDataSource3\" runat=\"server\" > </asp:SqlDataSource> ConnectionStrings:ApplicationServices %>" SelectCommand="SELECT [name]FROM [names]"> </asp:SqlDataSource> <asp:SqlDataSource ID="SqlDataSource2" runat="server" > </asp:SqlDataSource> <asp:SqlDataSource ID="SqlDataSource3" runat="server" > </asp:SqlDataSource>
protected void Page_Load(object sender, EventArgs e) { SqlDataSource2.ConnectionString = "Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True"; SqlDataSource2.SelectCommand = "select task_id,message,post_name,curnt_date,asign_name from task"; // string s2 = System.Web.HttpContext.Current.User.Identity.Name; Session["name"] = s2; }
protected void use(object sender, ListViewItemEventArgs e) { Label d = (Label)e.Item.FindControl(\"id_Label\"); ViewState[\"task_id\"] = d.Text; // try // { Label lblID =(Label)e.Item.FindControl(\"id_Label\") as Label; SqlDataSource sqlds =(SqlDataSource) e.Item.FindControl(\"SqlDataSource3\") as SqlDataSource; sqlds.ConnectionString = \"Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True\"; sqlds.SelectCommand = \"select comment,rply_name,rpl_date,task_id from rply where task_id =’\" + lblID.Text + \"’\"; }
protected void use(object sender, ListViewItemEventArgs e) { Label d = (Label)e.Item.FindControl("id_Label"); ViewState["task_id"] = d.Text; // try // { Label lblID =(Label)e.Item.FindControl("id_Label") as Label; SqlDataSource sqlds =(SqlDataSource) e.Item.FindControl("SqlDataSource3") as SqlDataSource; sqlds.ConnectionString = "Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True"; sqlds.SelectCommand = "select comment,rply_name,rpl_date,task_id from rply where task_id ='" + lblID.Text + "'"; }
My guess is that you get your error here: My guess is that you get your error here: sqlds.ConnectionString = "Data Source=DIMPLE;Initial Catalog=torqbolt;Integrated Security=True";because sqlds is null. Use the debugger and set a break point here:
because sqlds is null. Use the debugger and set a break point here:
Label d = (Label)e.Item.FindControl("id_Label");then step through the code.
then step through the code.
how to solve null reference exception ? step 1:Check in which you are getting Exception step 2:you must be invoking the member(method or property) of some object (that object must be not initialized any where) step 3: initialized that object of which you are calling the member (method or property)更多推荐
发出错误的System.NullReferenceException
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