treeview gridview 和框架结合使用的问题?请指点
最近做了个文档管理系统,使用treeview和gridview,tree放在左框架里,gridview放在主框架里.tree的节点是由数据库动态生成的,通过判断选择了节点的,主框架里的gridiew显示不同的内容.如果不使用框架,就把tree和gridview放在一个页面下了,测试能成功.但是放在框架后,第一次必须选择节点两次才触发gridview显示.同时我原来在页面下能实现的删除事件和打开选中事件也都失效了.恳请各路高手伸出援助之手.主要代码如下.
treeview的selectednodechanged事件的代码
protected void TV_SelectedNodeChanged(object sender, EventArgs e)
{
string depth = TV.SelectedNode.Depth.ToString();
string nodetext = TV.SelectedNode.Text.ToString();
string nodeparent;
switch (depth )//若为根节点不传父节点,不然会得到空值
{
case "0":
TV.SelectedNode.NavigateUrl = "main.aspx?nodetext="+nodetext+"&depth="+depth ;
break;
case "1":
TV.SelectedNode.NavigateUrl = "main.aspx?nodetext=" + nodetext + "&depth=" + depth;
break;
case "2":
nodeparent =TV.SelectedNode .Parent .Text .ToString ();
TV.SelectedNode.NavigateUrl = "main.aspx?nodetext=" + nodetext + "&depth=" + depth+"&nodeparent="+nodeparent ;
break;
default :
break;
}
}
主框架里的main.aspx的代码
protected void DataBinds()
{//传回所选节点文本,父节点文本和所选节点深度
int depth = Convert.ToInt32(Request .QueryString ["depth"].ToString ());
string nodeselect = Request.QueryString["nodetext"].ToString();
SqlConnection objConnection = new SqlConnection(strConnection);
switch (depth)
{
case 0:
//所选节点为系统.
String strSQL0 = "select * from DocInfo where DepName='" + nodeselect + "'";
SqlDataAdapter da0 = new SqlDataAdapter(strSQL0, objConnection);
DataSet Result0 = new DataSet();
da0.Fill(Result0);
//绑定数据到GridView
this.GridView1.DataSource = Result0;
GridView1.DataKeyNames = new string[] { "DocID" };
this.GridView1.DataBind();
break;
case 1:
//所选节点为项目
//绑定数据到GridView
String strSQL1 = "select * from DocInfo where ProName='" + nodeselect + "'";
SqlDataAdapter da1 = new SqlDataAdapter(strSQL1, objConnection);
DataSet Result1 = new DataSet();
da1.Fill(Result1);
this.GridView1.DataSource = Result1;
GridView1.DataKeyNames = new string[] { "DocID" };
this.GridView1.DataBind();
break;
case 2:
//所选节点为类别
//绑定数据到GridView
string nodeparent = Request.QueryString["nodeparent"].ToString();
String strSQL2 = "select * from DocInfo where ProName='" +nodeparent + "'and lbName='" + nodeselect + "' ";
SqlDataAdapter da2 = new SqlDataAdapter(strSQL2, objConnection);
DataSet Result2 = new DataSet();
da2.Fill(Result2);
this.GridView1.DataSource = Result2;
GridView1.DataKeyNames = new string[] { "DocID" };
this.GridView1.DataBind();
break;
default:
// 显示信息.
break;
}
}
删除选中事件代码,我这里是在页面里加了一个button控件的.gridview模板列里放了checkbox
protected void btnDeleteCheck_Click(object sender, EventArgs e)
{
String sqlText = "(";
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox cbx = (CheckBox)GridView1.Rows[i].FindControl("chkSelect");
if (cbx.Checked == true)
{
sqlText = sqlText + Convert.ToInt32(GridView1.DataKeys[i].Value) + ",";
}
}
sqlText = sqlText.Substring(0, sqlText.Length - 1) + ")";
sqlText = "delete DocInfo where DocID in" + sqlText;
try
{
//执行删除语句
SqlConnection conn = new SqlConnection(strConnection);
conn.Open();
SqlCommand cmd = new SqlCommand(sqlText, conn);
int delCount = Convert.ToInt32(cmd.ExecuteNonQuery()); //删除记录数量
Response.Write("<script>alert('共删除" + delCount + "条数据');</script>");
DataBinds();
}
catch (Exception ex)
{
//若有错误发生，输出错误信息
Response.Write("<script>alert('您没有选中任何数据');</script>");
}
}
打开选中事件,也是另加了一个button控件
protected void btnOpen_Click(object sender, EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox cbx = (CheckBox)GridView1.Rows[i].FindControl("chkSelect");
if (cbx.Checked == true)
{
int DocID = Convert.ToInt32(GridView1.DataKeys[i].Value);
Response.Redirect("openfile.aspx?DocID=" + DocID);//这里是一个下载二进制流的aspx
}
}
请问这是为什么??(当然若tree和gridview放在一个页面下,绑定函数略有不同,但方法是一样的,只不过不需要传值了,只需通过tV.Node.Depth/TV.SelectedNode.Text/TV.SelectedNode.Parent.Text来定义查询语句就可以了)
1.为什么tree选择节点两次才显示数据.
2.我的删除事件和打开选中事件都不能执行,为什么?
