如果我在数据库中手动输入值，那么我可以在墙上查看它，但我不知道如何在点击“喜欢”时以编程方式插入值。
我希望点击“喜欢”（在msg下面的每一行中）触发的查询是"insert into tbl_like (ScrapId,FromId,LikeStatus) values(A*,sessionUserID,1)";
A * =这必须是点击之类的特定行的Scrapid。
数据库表： Scrap_Table： ScrapId | FromId | ToId |消息
Like_table：
LikeId | ScrapId | FromId | LikeStatus
源代码：
<asp:GridView ID="GridViewUserScraps" ItemStyle-VerticalAlign="Top" AutoGenerateColumns="False"
GridLines="None" Width="100%" ShowHeader="False" runat="server" AlternatingRowStyle-BackColor="#A5A5A5"
CellPadding="4" ForeColor="#333333" DataKeyNames="ScrapId"
OnItemCommand="CommandLinkClicked">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<table align="left" cellpadding="1" cellspacing="2">
<tr>
<td>
<a href='<%#getUserHREF(Container.DataItem)%>'>
<img align="middle" src='<%#getSRC(Container.DataItem)%>' border="0" width="50px" /></a>
</td>
<td>
</td>
</tr>
</table>
<div align="justify">
<%#DataBinder.Eval(Container.DataItem, "Message")%>
<br />
<br />
</div>
<span class="SmallBlackText">Posted On: </span>
<asp:Label ID="lblSendDate" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"SendDate")%>'></asp:Label>
</span>
<br />
<%-- <asp:LinkButton ID="lnklike" runat="server"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>"
CommandName="LikeCmd">Like</asp:LinkButton>
<asp:LinkButton ID="lnkunlike" runat="server">unlike</asp:LinkButton>--%>
<asp:LinkButton ID="lnklike" runat="server" CommandName="like" CommandArgument='<%# Eval("ScrapId")%>'>Like</asp:LinkButton>
<asp:LinkButton ID="lnkunlike" runat="server" CommandName="unlike" CommandArgument='<%# Eval("ScrapId")%>'>unlike</asp:LinkButton>
<asp:Label ID="lbllike" runat="server" Text="likes:"></asp:Label>
<%-- <asp:Label ID="lbllikecount" runat="server" Text="0"></asp:Label>--%>
<asp:Label ID="Label1" runat="server" Text='<%# Controls_GetUserScraps.abc((int)Eval("ScrapId")) %>' />
<%--<asp:Label ID="Label1" runat="server" Text='<%# WebPageName.StaticMethodName((int)Eval("ScrapId")) %>' />--%>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle BackColor="#EFF3FB" />
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#2461BF" />
<AlternatingRowStyle BackColor="White" />
</asp:GridView>
代码背后：
DataBaseClass dbClass = new DataBaseClass();
public DataTable dt;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
GetUserScraps(int.Parse(Request.QueryString["Id"].ToString()));
}
}
public void GetUserScraps(int Id)
{
string getUserScraps = "SELECT u.Id as UserId,u.firstname,u.ImageName,s.FromId,s.ToId,s.Message,s.SendDate,s.ID as ScrapId FROM [User] as u, Scrap as s WHERE u.Id=s.FromId AND s.ToId='" + Request.QueryString["Id"].ToString() + "'";
//string getlikes = "select COUNT(*) from tbl_like inner join Scrap on tbl_like.scrapid=Scrap.Id where tbl_like.likestatus=1 and tbl_like.scrapid='"+<%#DataBinder.Eval(Container.DataItem,"ScrapId")%>+"'";
// <%#DataBinder.Eval(Container.DataItem,"ScrapId")%>
dt = dbClass.ConnectDataBaseReturnDT(getUserScraps);
if (dt.Rows.Count > 0)
{
GridViewUserScraps.DataSource = dt;
GridViewUserScraps.DataBind();
}
}
public string getUserHREF(object sURL)
{
DataRowView dRView = (DataRowView)sURL;
string Id = dRView["UserId"].ToString();
return ResolveUrl("~/UserDetails.aspx?Id=" + Id);
}
public string getSRC(object imgSRC)
{
DataRowView dRView = (DataRowView)imgSRC;
string ImageName = dRView["ImageName"].ToString();
if (ImageName == "NoImage")
{
return ResolveUrl(@"~/Site_Images/image_missing.jpg");
}
else
{
return ResolveUrl("~/UserImage/" + dRView["ImageName"].ToString());
}
}
public static int abc(int scrpid)
{
string getlikes = "select COUNT(*) from tbl_like inner join Scrap on tbl_like.scrapid=Scrap.Id where tbl_like.likestatus=1 and tbl_like.scrapid='"+scrpid+"'";
dboperation dbo = new dboperation();
int a = dbo.GetLikesMethod(getlikes);
return a;
}
protected void CommandLinkClicked(object sender, DataGridCommandEventArgs e)
{
var scrapId = Int32.Parse(e.CommandArgument.ToString());
switch (e.CommandName)
{
case "like":
var con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["constr"].ConnectionString); //your connection string
var cmd = new SqlCommand("insert into tbl_like (ScrapId,FromId,LikeStatus) values(@scrapId,@sessionUser,1)");
cmd.Parameters.AddWithValue("@scrapId", scrapId);
cmd.Parameters.AddWithValue("@sessionUser", Session["UserId"]);
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();
break;
case "unlike":
//do stuff
break;
}
}
}
答案 0 :(得分：1)
您必须将OnItemCommand事件添加到网格中才能处理链接按钮上的点击。此外，两个链接按钮都必须设置CommandName和CommandArgument。
按如下方式更改您的HTML：
<asp:GridView .... OnRowCommand="GridViewRowCommand">
<asp:LinkButton ID="lnklike" runat="server" CommandName="like" CommandArgument='<%# Eval("ScrapId")%>'>Like</asp:LinkButton>
<asp:LinkButton ID="lnkunlike" runat="server" CommandName="unlike" CommandArgument='<%# Eval("ScrapId")%>'>unlike</asp:LinkButton>
</asp:GridView>
这是代码背后的事件：
protected void GridViewRowCommand(Object sender, GridViewCommandEventArgs e)
{
var scrapId = Int32.Parse(e.CommandArgument.ToString());
switch (e.CommandName)
{
case "like" :
using (var con = new SqlConnection("connection_string")) //your connection string
{
var cmd = new SqlCommand("insert into tbl_like (ScrapId,FromId,LikeStatus) values(@scrapId,@sessionUser,1)");
cmd.Parameters.AddWithValue("@scrapId", scrapId);
cmd.Parameters.AddWithValue("@sessionUser", Session[User]);
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();
}
break;
case "unlike" :
//do stuff
break;
}
}