Datagrid升序，降序问题！急~

[zcc26212]

我本意是实现 datagrid排序功能!每次点击列名,都按照一次升序一次降序这样排序.但是只有降序没有升序,这是那里的错误啊!
代码如下:
<aspx.cs中!>
public void DataList_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
{
ViewState["DataSortExpression"]=e.SortExpression;
string newExpr=e.SortExpression;
string oldExpr=(string)ViewState["DataSortExpression"];
DataSet ds=new DataSet();
ds=(DataSet)Context.Cache["ID"];
if(ds==null)
{
ds=DbU.GetDS(text);//获取dataset
Context.Cache.Insert("ID",ds);
}
if(oldExpr==newExpr)
{
ViewState["DataSortExpression"]=newExpr+" DESC";
}
else
{
ViewState["DataSortExpression"]=newExpr+" ASC";
}
DataView dataview=new DataView();
dataview=ds.Tables[0].DefaultView;
dataview.Sort=(string)ViewState["DataSortExpression"];
DataList.DataSource=dataview;
DataList.DataBind();
}
<aspx中>
<Columns>
<asp:BoundColumn DataField="dlyh" HeaderText="用户名"></asp:BoundColumn>
<asp:BoundColumn DataField="dlmm" HeaderText="密　码"></asp:BoundColumn>
<asp:BoundColumn DataField="kjkh" HeaderText="井　号" SortExpression="kjkh"></asp:BoundColumn>
<asp:BoundColumn DataField="dljb" HeaderText="权　限"></asp:BoundColumn>
</Columns>

[xray2005]

这个功能常见哈，学习ing 。。。。。。。。。。

帮LZ UP

[Eddie005]

下面这3行代码明显有逻辑错误，你到底是要把哪个值赋到哪里呢？

ViewState["DataSortExpression"]=e.SortExpression;
string newExpr=e.SortExpression;
string oldExpr=(string)ViewState["DataSortExpression"];

[xray2005]

LZ试试：
ViewState["DataSortExpression"]=e.SortExpression;
string newExpr=e.SortExpression;
string oldExpr=(string)ViewState["DataSortExpression"];

换成：
string oldExpr=(string)ViewState["DataSortExpression"];
ViewState["DataSortExpression"]=e.SortExpression;
string newExpr=e.SortExpression;

[zcc26212]

按照xray2005(特意把社区昵称写的很长,只是为了看看最多能输入多少字符！)
的办法还是不行 郁闷啊!

[zcc26212]

谁能帮帮我！*_*

[Eddie005]

完整例子：
public string SortField//当前排序字段
{
get
{
return (ViewState["SortField"]==null)?string.Empty:ViewState["SortField"].ToString();
}
set
{
ViewState["SortField"] = value;
}
}
public string SortMode//当前排序方式：ASC/DESC
{
get
{
return (ViewState["SortMode"]==null)?string.Empty:ViewState["SortMode"].ToString();
}
set
{
ViewState["SortMode"] = value;
}
}

private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
this.BindData(null);
}
}

private void BindData(string sortExpress)
{
DataTable dt = new DataTable();
dt.Columns.Add("id");dt.Columns.Add("message");dt.Columns.Add("date");

//这只是些测试数据：
dt.Rows.Add(new object[]{"aga",70,DateTime.Now.AddDays(1)});
dt.Rows.Add(new object[]{"aweg",DateTime.Now.AddDays(10)});
dt.Rows.Add(new object[]{"a4haaa",2,DateTime.Now.AddDays(13)});
dt.Rows.Add(new object[]{"drjtakab",12,DateTime.Now.AddDays(19)});
dt.Rows.Add(new object[]{"hsraac",22,DateTime.Now.AddDays(11)});
dt.Rows.Add(new object[]{"jdrtb",50});
dt.Rows.Add(new object[]{"drtb111",DateTime.Now.AddDays(7)});
dt.Rows.Add(new object[]{"kfb111-111",2});
dt.Rows.Add(new object[]{"brth1",3});
dt.Rows.Add(new object[]{"mdrth",5,DateTime.Now.AddDays(-5)});
dt.Rows.Add(new object[]{"serc",0});
dt.Rows.Add(new object[]{"ag3ca",4,DateTime.Now});
dt.AcceptChanges();

DataView dv = dt.DefaultView;
if(sortExpress!=null) dv.Sort = sortExpress;

this.DataGrid1.DataSource = dt;
this.DataGrid1.DataBind();

}

private void DataGrid1_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
{

if(this.SortField == e.SortExpression )
{

if(this.SortMode == " ASC")
this.SortMode = " DESC";
else if(this.SortField == " Desc")
this.SortMode = " ASC";
else
this.SortMode = " ASC";
}
else
{
this.SortMode = " ASC";
}

this.SortField = e.SortExpression;

this.BindData(this.SortField + this.SortMode);
}

[zcc26212]

谁能帮帮我！谢谢了！

[zcc26212]

郁闷阿！为什么我在属性生成器中用BoundColumn生成的列，只能一次排序（也就是说只能点击一次！），但是不用BoundColumn生成，也就是用代马在cs里面邦定就可以实现升降排序呢！球高人指教阿！

[zcc26212]

自己顶 郁闷