思路:通过一个ArrayList来保持你已经选择的项的ID,当页索引变化时,将触发DataBinding事件,在该事件内调用CollectSelected()方法,来保存所有CheckBox选中的行,去掉那些未选中的行ID。在RowDataBound(),通过SelectedItems中保存的ID来设置是否选中,以回显你的操作。需要注意的是,在你提交的时候,一定要再调用一次CollectSelected(),以最后一次收集当前页的选中情况。
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protected ArrayList SelectedItems
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{
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get
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{
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return (ViewState["mySelectedItems"] != null) ? (ArrayList)ViewState["mySelectedItems"] : null;
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}
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set
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{
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ViewState["mySelectedItems"] = value;
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}
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}
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/// <summary>
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/// 从当前页收集选中项的情况
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/// </summary>
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protected void CollectSelected()
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{
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ArrayList selectedItems = null;
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if (this.SelectedItems == null)
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selectedItems = new ArrayList();
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else
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selectedItems = this.SelectedItems;
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for (int i = 0; i < this.gvWorks.Rows.Count; i++)
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{
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CheckBox cb = (CheckBox)gvWorks.Rows.FindControl("cbChoose");
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string id = ((Label)gvWorks.Rows.FindControl("lbID")).Text;
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if (selectedItems.Contains(id) && !cb.Checked)
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selectedItems.Remove(id);
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if (!selectedItems.Contains(id) && cb.Checked)
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selectedItems.Add(id);
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}
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SelectedItems = selectedItems;
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}
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protected void gvWorks_DataBinding(object sender, EventArgs e)
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{
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//在每一次重新绑定之前,需要调用CollectSelected方法从当前页收集选中项的情况
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CollectSelected();
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}
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protected void gvWorks_RowDataBound(object sender, GridViewRowEventArgs e)
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{
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//这里的处理是为了回显之前选中的情况
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if (e.Row.RowIndex > -1 && SelectedItems!=null)
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{
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DataRowView row = e.Row.DataItem as DataRowView;
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CheckBox cb = (CheckBox)e.Row.FindControl("cbChoose");
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Label lbID = (Label)e.Row.FindControl("lbID");
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if(SelectedItems.Contains(lbID.Text))
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cb.Checked = true;
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else
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cb.Checked = false;
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}
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}
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