[英]GridView lost search result after change page size or click on paging?
I have a gridview to show the data and and text box to do the search. 我有一个gridview来显示数据和文本框来进行搜索。 When i search, the gridview could show the data correctly, but when I click on change page size or go to next page, the gridview will reload to the original state. 当我搜索时,gridview可以正确显示数据,但是当我单击更改页面大小或转到下一页时,gridview将重新加载到原始状态。 Is there anything to do with the ViewState? 与ViewState有什么关系吗? Appreciate is someone could help. 赞赏有人可以提供帮助。 following is my code: 以下是我的代码:
protected void Page_Load(object sender, EventArgs e)
{
}
protected void ddPageSize_SelectedIndexChanged(object sender, EventArgs e)
{
// handle event
DropDownList ddpagesize = sender as DropDownList;
GridView1.PageSize = Convert.ToInt32(ddpagesize.SelectedItem.Text);
ViewState["PageSize"] = ddpagesize.SelectedItem.Text;
GridView1.DataBind();
}
protected void btnSearch_Click(object sender, EventArgs e)
{
SqlDataSource1.SelectCommand = "" + txtSearchValue.Text + "'";
GridView1.DataBind();
}
protected void btnReload_Click(object sender, EventArgs e)
{
txtSearchValue.Text = "";
lblSearchError.Text = "";
GridView1.DataBind();
}
protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
foreach (GridViewRow row in GridView1.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
row.Attributes["onmouseover"] =
"this.style.backgroundColor;this.style.backgroundColor='#AED4EB';";
row.Attributes["onmouseout"] =
"this.style.textDecoration='none';this.style.background='#ffffff';";
// Set the last parameter to True
// to register for event validation.
row.Attributes["onclick"] =
Page.ClientScript.GetPostBackClientHyperlink(GridView1,
"Select$" + row.DataItemIndex, true);
}
}
base.Render(writer);
}
protected void btnDate_Click(object sender, EventArgs e)
{
SqlDataSource1.SelectCommand = "";
GridView1.DataBind();
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
int rowindex = GridView1.SelectedIndex % GridView1.PageSize;
GridViewRow row = GridView1.Rows[rowindex];
Session["TSO"] = row.Cells[7].Text.Trim();
string url = "http://localhost:60918/Requests.aspx";
StringBuilder sb = new StringBuilder();
sb.AppendLine("<script type='text/javascript'>");
sb.AppendLine("window.open('" + url + "')");
sb.AppendLine("<" + "/script>");
ScriptManager.RegisterStartupScript(upGrdCustomers, upGrdCustomers.GetType(), "myjs", sb.ToString(), false);
}
catch (System.Threading.ThreadAbortException)
{
throw;
}
}
Here is my code for the GridView: 这是我的GridView代码:
[ToolboxData("<{0}:GridView runat=server></{0}:GridView>")]
public class GridView : System.Web.UI.WebControls.GridView, IPageableItemContainer
{
/// <summary>
/// TotalRowCountAvailable event key
/// </summary>
private static readonly object EventTotalRowCountAvailable = new object();
/// <summary>
///
/// </summary>
/// <param name="dataSource"></param>
/// <param name="dataBinding"></param>
/// <returns></returns>
protected override int CreateChildControls(IEnumerable dataSource, bool dataBinding)
{
int rows = base.CreateChildControls(dataSource, dataBinding);
// if the paging feature is enabled, determine
// the total number of rows in the datasource
if (this.AllowPaging)
{
// if we are databinding, use the number of rows that were created,
// otherwise cast the datasource to an Collection and use that as the count
int totalRowCount = dataBinding ? rows : ((ICollection)dataSource).Count;
// raise the row count available event
IPageableItemContainer pageableItemContainer = this as IPageableItemContainer;
this.OnTotalRowCountAvailable(
new PageEventArgs(
pageableItemContainer.StartRowIndex,
pageableItemContainer.MaximumRows,
totalRowCount
)
);
// make sure the top and bottom pager rows are not visible
if (this.TopPagerRow != null)
{
this.TopPagerRow.Visible = false;
}
}
return rows;
}
#region IPageableItemContainer Interface
/// <summary>
///
/// </summary>
/// <param name="startRowIndex"></param>
/// <param name="maximumRows"></param>
/// <param name="databind"></param>
void IPageableItemContainer.SetPageProperties(
int startRowIndex, int maximumRows, bool databind)
{
int newPageIndex = (startRowIndex / maximumRows);
this.PageSize = maximumRows;
if (this.PageIndex != newPageIndex)
{
bool isCanceled = false;
if (databind)
{
// create the event args and raise the event
GridViewPageEventArgs args = new GridViewPageEventArgs(newPageIndex);
this.OnPageIndexChanging(args);
isCanceled = args.Cancel;
newPageIndex = args.NewPageIndex;
}
// if the event wasn't cancelled
// go ahead and change the paging values
if (!isCanceled)
{
this.PageIndex = newPageIndex;
if (databind)
{
this.OnPageIndexChanged(EventArgs.Empty);
}
}
if (databind)
{
this.RequiresDataBinding = true;
}
}
}
/// <summary>
///
/// </summary>
int IPageableItemContainer.StartRowIndex
{
get { return this.PageSize * this.PageIndex; }
}
/// <summary>
///
/// </summary>
int IPageableItemContainer.MaximumRows
{
get { return this.PageSize; }
}
/// <summary>
///
/// </summary>
event EventHandler<PageEventArgs> IPageableItemContainer.TotalRowCountAvailable
{
add { base.Events.AddHandler(GridView.EventTotalRowCountAvailable, value); }
remove { base.Events.RemoveHandler(GridView.EventTotalRowCountAvailable, value); }
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected virtual void OnTotalRowCountAvailable(PageEventArgs e)
{
EventHandler<PageEventArgs> handler = (EventHandler<PageEventArgs>)base.Events[GridView.EventTotalRowCountAvailable];
if (handler != null)
{
handler(this, e);
}
}
#endregion
}
} }
In your server side event handler called ddPageSize_SelectedIndexChanged you are calling Databind on your grid without checking if there is a search term entered and setting that on the DataSource of the Grid. 在名为ddPageSize_SelectedIndexChanged的服务器端事件处理程序中,您正在网格上调用Databind而不检查是否输入了搜索项并在网格的DataSource上进行了设置。
protected void ddPageSize_SelectedIndexChanged(object sender, EventArgs e) 受保护的void ddPageSize_SelectedIndexChanged(对象发送者,EventArgs e)
{ ... {...
SqlDataSource1.SelectCommand = "" + txtSearchValue.Text + "'"; SqlDataSource1.SelectCommand =“” + txtSearchValue.Text +“'”;
GridView1.DataBind(); GridView1.DataBind();} }
Try this. 尝试这个。 When you change the pagesize
it triggers a postback and leaving the value for SelectCommand
as empty resulting the gridview to load in it's original state. 当您更改pagesize
它会触发回发,并将SelectCommand
的值保留为空,从而导致gridview以其原始状态加载。 Set it to txtSearchValue.Text
and try 将其设置为txtSearchValue.Text
并尝试
protected void ddPageSize_SelectedIndexChanged(object sender, EventArgs e)
{
// handle event
DropDownList ddpagesize = sender as DropDownList;
GridView1.PageSize = Convert.ToInt32(ddpagesize.SelectedItem.Text);
ViewState["PageSize"] = ddpagesize.SelectedItem.Text;
SqlDataSource1.SelectCommand = "" + txtSearchValue.Text + "'";
GridView1.DataBind();
}
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