Question

我有一个Gridview从数据库中提取描述文本，一旦超过某些文本限制，我希望Gridview让用户点击＆＃34;阅读更多＆＃34;从那里他们可以看到全文而无需导航到新的URL。先感谢您。我的Gridview列如下：

<asp:BoundField DataField="Id" HeaderText="Id" SortExpression="Id" InsertVisible="False" ReadOnly="True"  />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />
<asp:BoundField DataField="Phone" HeaderText="Phone" SortExpression="Phone" />
<asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" />
<asp:BoundField DataField="Source" HeaderText="Source" SortExpression="Source" />
<asp:BoundField DataField="Message" HeaderText="Message" SortExpression="Message" />
<asp:BoundField DataField="Date" HeaderText="Date" DataFormatString="{0:dd/MM/yyyy}" SortExpression  ="Date"  />

Answer 1

使用Lable Control和LinkButton添加ItemTemplate，如GridView中所示：

<asp:TemplateField>
  <ItemTemplate>
    <asp:Label ID="Label20" runat="server" Text='<%#((string)Eval("ColumnName")).Length<20?Eval("ColumnName"):((string)Eval("ColumnName")).Substring(0,20)+"..." %>' ToolTip='<%#Eval("question") %>' Width="100"></asp:Label>
    <asp:LinkButton ID="LinkButton1" runat="server" Visible='<%#SetVisibility(Eval("ColumnName"),20) %>' OnClick="LinkButton1_Click">Read More...</asp:LinkButton>
  </ItemTemplate>
</asp:TemplateField>

这里的Lable文本只包含20个字符和链接按钮，将显示Read More但Lable工具提示包含该列的所有字符。在链接按钮上单击，我们将触发一个事件以显示该标签中的所有数据。

 protected void LinkButton1_Click(object sender, EventArgs e)
        {
            //Read More Link Button from Gridview on Click
            LinkButton lb = (LinkButton)sender;
            GridViewRow row = lb.NamingContainer as GridViewRow;
            //Finding the description Text Lable
            Label qst = row.FindControl("Label20") as Label;
            // Setting Link Button Text 
            lb.Text = (lb.Text == "Read More...") ? "Hide..." : "Read More...";
            //Swaping tooltip value to text and vices versa as Tooltip has all charecters
            string temp = qst.Text;
            qst.Text = qst.ToolTip;
            qst.ToolTip = temp;
        }
protected bool SetVisibility(object Desc, int length)
        {
            return Desc.ToString().Length > length;
        }

希望这可以帮助您找到解决方案。

<强> 更新

似乎你的列有空值来处理这个你可以检查null然后转换：

<asp:TemplateField>
      <ItemTemplate>
        <asp:Label ID="Label20" runat="server" Text='<%#Eval("ColumnName")==DBNull.Value ? string.Empty :(((string)Eval("ColumnName")).Length<20?Eval("ColumnName"):((string)Eval("ColumnName")).Substring(0,20)+"...")  %>' ToolTip='<%#Eval("question") %>' Width="100"></asp:Label>
        <asp:LinkButton ID="LinkButton1" runat="server" Visible='<%# Eval("ColumnName")==DBNull.Value ? false :SetVisibility(Eval("ColumnName"),20) %>' OnClick="LinkButton1_Click">Read More...</asp:LinkButton>
      </ItemTemplate>
    </asp:TemplateField>

Answer 2

我建议使用linkbutton并绑定ItemTemplate中的消息：

<asp:TemplateField HeaderText="Message">
            <ItemTemplate>
                <%# Bind("Message") %> - <asp:linkbutton id="btnReadMore" runat="server" causesvalidation="false" commandname="readmore" commandargument="<%# Bind("MessageId") %>"  />
            </ItemTemplate>
        </asp:TemplateField>

然后，链接按钮的逻辑可以弹出

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "readmore")
        {
            Session["messageid"] = e.CommandArgument.ToString();
            Response.Redirect("popuppage.aspx?id=" + Session["messageid"].ToString() + "");
        }
    }

在popuppage.aspx中将使用查询字符串中的messageid获取完整消息的逻辑。

添加“阅读更多”按钮以查看Gridview描述文本

2 个答案: