更新面板在我只是尝试进行部分回发时会执行完整的回发。 我只希望能够更新中继器,而不是在单击上一页和下一页的超链接时更新整个页面。
protected void Page_Load(object sender, EventArgs e)
{
PagedDataSource objpd = new PagedDataSource();
string connStr = ConfigurationManager.ConnectionStrings["yafnet"].ConnectionString;
SqlConnection mySQLconnection = new SqlConnection(connStr);
if (mySQLconnection.State == ConnectionState.Closed)
{
mySQLconnection.Open();
}
SqlCommand mySqlSelect = new SqlCommand("SELECT * FROM [Comments]", mySQLconnection);
mySqlSelect.CommandType = CommandType.Text;
SqlDataAdapter mySqlAdapter = new SqlDataAdapter(mySqlSelect);
DataTable table = new DataTable();
mySqlAdapter.Fill(table);
objpd.DataSource = table.DefaultView;
objpd.AllowPaging = true;
objpd.PageSize = 1;
int currentPage;
if (Request.QueryString["page"] != null)
{
currentPage = Int32.Parse(Request.QueryString["page"]);
}
else
{
currentPage = 1;
}
objpd.CurrentPageIndex = currentPage - 1;
// Label1.Text = "Page " + currentPage + " of " + pds.PageCount;
if (!objpd.IsFirstPage)
{
linkPrev.NavigateUrl = Request.CurrentExecutionFilePath + "?page=" + (currentPage - 1);
}
if (!objpd.IsLastPage)
{
linkNext.NavigateUrl = Request.CurrentExecutionFilePath + "?page=" + (currentPage + 1);
}
Repeater1.DataSource = objpd;
Repeater1.DataBind();
}
这是我的网页
<div class="comment">
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:Repeater ID="Repeater1" runat="server">
<HeaderTemplate>
<table class="commentsx" cellspacing="0">
</HeaderTemplate>
<ItemTemplate>
<tr>
<td class="name">
<div class="right">
<%# Eval("CommentUserName") %>
</div>
<div class="left">
<%# Eval("CommentDateTime") %>
</div>
</td>
</tr>
<tr>
<td>
<div class="mess">
<%# Eval("CommentMessage") %>
</div>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<asp:HyperLink ID="linkPrev" runat="server">Previous Page</asp:HyperLink>
<asp:HyperLink ID="linkNext" runat="server">Next Page</asp:HyperLink>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="DataBinding" />
</Triggers>
</asp:UpdatePanel>
</div>
Hyperlink
控件根本不执行回发,它们评估为将执行 GET 而不是 POST 的常规链接。
由于您似乎想要看起来像链接的东西,但执行回发而不是 GET,因此您需要的是LinkButton
。 它看起来像一个链接,但就像一个按钮并执行回发。
图 我会发布我自己问题的答案,因为我在 Servy 的帮助下弄清楚了。 超链接做一个 Get Not a 帖子,这就是为什么我上面的先前代码不起作用的原因。 因此,我重新设计了代码以包含以下内容。
- 我添加了两个按钮
- 为创建 POST 的两个按钮创建事件处理程序
这是我的代码可能会帮助某人
public int CurrentPage
{
get
{
// look for current page in ViewState
object o = this.ViewState["_CurrentPage"];
if (o == null)
return 0; // default to showing the first page
else
return (int)o;
}
set
{
this.ViewState["_CurrentPage"] = value;
}
}
private void updateMessage()
{
PagedDataSource objpd = new PagedDataSource();
string connStr = ConfigurationManager.ConnectionStrings["yafnet"].ConnectionString;
SqlConnection mySQLconnection = new SqlConnection(connStr);
if (mySQLconnection.State == ConnectionState.Closed)
{
mySQLconnection.Open();
}
SqlCommand mySqlSelect = new SqlCommand("SELECT * FROM [Comments]", mySQLconnection);
mySqlSelect.CommandType = CommandType.Text;
SqlDataAdapter mySqlAdapter = new SqlDataAdapter(mySqlSelect);
DataTable table = new DataTable();
mySqlAdapter.Fill(table);
objpd.DataSource = table.DefaultView;
objpd.AllowPaging = true;
objpd.PageSize = 1;
objpd.CurrentPageIndex = CurrentPage;
//disable pre or next buttons if necessary
cmdPrev.Enabled = !objpd.IsFirstPage;
cmdNext.Enabled = !objpd.IsLastPage;
Repeater1.DataSource = objpd;
Repeater1.DataBind();
}
protected void Page_Load(object sender, EventArgs e)
{
updateMessage();
}
protected void cmdPrev_Click(object sender, EventArgs e)
{
// Set viewstate variable to the previous page
CurrentPage -= 1;
// Reload control
updateMessage();
}
protected void cmdNext_Click(object sender, EventArgs e)
{
// Set viewstate variable to the next page
CurrentPage += 1;
// Reload control
updateMessage();
}
这是我的 HTML
<div class="comment">
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<asp:Repeater ID="Repeater1" runat="server">
<HeaderTemplate>
<table class="commentsx" cellspacing="0">
</HeaderTemplate>
<ItemTemplate>
<tr>
<td class="name">
<div class="right">
<%# Eval("CommentUserName") %>
</div>
<div class="left">
<%# Eval("CommentDateTime") %>
</div>
</td>
</tr>
<tr>
<td>
<div class="mess">
<%# Eval("CommentMessage") %>
</div>
</td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<asp:button id="cmdPrev" runat="server" text=" << " onclick="cmdPrev_Click"></asp:button>
<asp:button id="cmdNext" runat="server" text=" >> " onclick="cmdNext_Click"></asp:button></td>
</ContentTemplate>
</asp:UpdatePanel>
</div>