GridView排序加上下箭头(2)

GridView排序加上下箭头
上面的方法很不爽，自己从新做了一个,在我以前的代码基础之上修改的.这种方法才是我要的真正效果.
特公布代码如下:
前端页面代码没变,CS代码.

  1using System;
  2using System.Data;
  3using System.Configuration;
  4using System.Collections;
  5using System.Web;
  6using System.Web.Security;
  7using System.Web.UI;
  8using System.Web.UI.WebControls;
  9using System.Web.UI.WebControls.WebParts;
 10using System.Web.UI.HtmlControls;
 11
 12
 13public partial class ComEmployee : System.Web.UI.Page
 14{
 15    protected void Page_Load(object sender, EventArgs e)
 16    {
 17        if (!IsPostBack)
 18        {
 19            this.txtDate.Text = DateTime.Now.ToString("MM/dd/yyyy");
 20            this.btnGetEmp.Attributes["onclick"] = "changeStatus();";
 21            GridViewBind();
 22        }
 23    }
 24    private void GridViewBind()
 25    {
 26        //監測當前的排序狀況
 27        if (this.ViewState["orderByName"] == null)
 28        {
 29            ViewState["orderByName"] = "g_time";
 30            ViewState["orderByType"] = "asc";
 31        }
 32
 33        //獲取當前ViewState中保存的排序
 34        string orderByName = this.ViewState["orderByName"].ToString();
 35        string orderByType = this.ViewState["orderByType"].ToString();
 36        WebClass.NewEmpClass tmp = new WebClass.NewEmpClass();
 37        DataTable dt = tmp.ComEmployyeeList();
 38        DataView dv = dt.DefaultView;
 39        dv.Sort = orderByName+" "+ orderByType;
 40        myGridView.DataSource = dv;
 41        myGridView.DataBind();
 42        labRecordCount.Text = "共<font color='red'>" + dt.Rows.Count.ToString() + "</font>筆記錄";
 43        labPageCount.Text = "頁次<font color='blue'>" + (myGridView.PageIndex + 1).ToString() + "</font>/<font color='red'>" + myGridView.PageCount.ToString() + "</font>頁";
 44        labPageRecord.Text = "<font color='red'>" + myGridView.PageSize.ToString() + "</font>筆記錄/頁";
 45
 46        if (dt.Rows.Count == 0)
 47        {
 48            btnFirst.Visible = false;
 49            btnPrev.Visible = false;
 50            btnNext.Visible = false;
 51            btnLast.Visible = false;
 52
 53            labRecordCount.Visible = false;
 54            labPageCount.Visible = false;
 55            labPageRecord.Visible = false;
 56        }
 57        else if (myGridView.PageCount == 1)
 58        {
 59            btnFirst.Visible = false;
 60            btnPrev.Visible = false;
 61            btnNext.Visible = false;
 62            btnLast.Visible = false;
 63        }
 64
 65        btnFirst.CommandName = "1";
 66        btnPrev.CommandName = (myGridView.PageIndex == 0 ? "1" : myGridView.PageIndex.ToString());
 67        btnNext.CommandName = (myGridView.PageCount == 1 ? myGridView.PageCount.ToString() : (myGridView.PageIndex + 2).ToString());
 68        btnLast.CommandName = myGridView.PageCount.ToString();
 69        BtnValidate();
 70    }
 71    private void BtnValidate()
 72    {
 73        if (myGridView.PageIndex + 1 >= myGridView.PageCount)
 74        {
 75            btnNext.Enabled = false;
 76            btnLast.Enabled = false;
 77        }
 78        else
 79        {
 80            btnNext.Enabled = true;
 81            btnLast.Enabled = true;
 82        }
 83        if (myGridView.PageIndex + 1 <= 1)
 84        {
 85            btnPrev.Enabled = false;
 86            btnFirst.Enabled = false;
 87        }
 88        else
 89        {
 90            btnPrev.Enabled = true;
 91            btnFirst.Enabled = true;
 92        }
 93    }
 94    protected void PagerButtonClick(object sender, EventArgs e)
 95    {
 96        myGridView.PageIndex = Convert.ToInt32(((LinkButton)sender).CommandName) - 1;
 97        GridViewBind();
 98    }
 99    protected void myGridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
100    {
101        myGridView.PageIndex = e.NewPageIndex;
102        GridViewBind();
103    }
104    protected void myGridView_RowDataBound(object sender, GridViewRowEventArgs e)
105    {
106        if (e.Row.RowIndex != -1)
107        {
108            int orderID = this.myGridView.PageIndex * this.myGridView.PageSize + e.Row.RowIndex + 1;
109            e.Row.Cells[0].Text = orderID.ToString();
110        }
111    }
112    protected void myGridView_Sorting(object sender, GridViewSortEventArgs e)
113    {
114        this.setViewState(e.SortExpression, this.ViewState["orderByType"].ToString() == "asc" ? "desc" : "asc");
115        GridViewBind();
116    }
117    /**//// <summary>
118    /// 以ViewState控制排序,寫入排序字段名及排序方式
119    /// </summary>
120    private void setViewState(string orderByName, string orderByType)
121    {
122        ViewState["orderByName"] = orderByName;
123        ViewState["orderByType"] = orderByType;
124    }
125
126    private string SortExpression
127    {
128        get
129        {
130            if (ViewState["orderByName"] != null && ViewState["orderByName"].ToString() != string.Empty)
131            {
132                return ViewState["orderByName"].ToString();
133            }
134            else
135            {
136                return "";
137            }
138        }
139        set
140        {
141            ViewState["orderByName"] = value;
142        }
143    }
144    private string sort
145    {
146        get
147        {
148            if (ViewState["orderByType"] != null && ViewState["orderByType"].ToString() != string.Empty)
149            {
150                return ViewState["orderByType"].ToString();
151            }
152            else
153            {
154                return "";
155            }
156        }
157        set
158        {
159            ViewState["orderByType"] = value;
160        }
161    }
162    protected void imgbtnUpdate_Click(object sender, ImageClickEventArgs e)
163    {
164        GridViewBind();
165    }
166    protected void btnGetEmp_Click(object sender, EventArgs e)
167    {
168        string strEmpno = Request.Form.Get("chkID");
169        WebClass.NewEmpClass tmp = new WebClass.NewEmpClass();
170        tmp.CheckNewEmployyee(strEmpno);
171    }
172    protected void myGridView_RowCreated(object sender, GridViewRowEventArgs e)
173    {
174        for (int i = 0; i < myGridView.Columns.Count; i++)
175        {
176            //if (i == 0) continue;
177            if (e.Row.RowIndex == -1)
178            {
179                if (myGridView.Columns[i].SortExpression == SortExpression)
180                {
181                    try
182                    {
183                        TableCell tableCell = e.Row.Cells[i];
184                        Label lblSorted = new Label();
185                        lblSorted.Font.Name = "webdings";
186                        lblSorted.Width = 20;
187                        lblSorted.Text = (sort == "asc" ? "6" : "5");
188                        tableCell.Controls.Add(lblSorted);
189                    }
190                    catch { }
191                }
192            }
193        }
194
195    }
196}
197

在实现这种方法时有一些感触,分享如下:
1.GridGriew中的DataView.sort属性排序时可以保存状态,DataGrid就不行,只能对当前页进行排序,所以每次实现这种功能时都把参数传到数据层.很郁闷.
2.忘記了，剛才還記得，哎記憶力不好了，想起來了再寫，要幹活了。
3.orderByName和orderByType之間要加空格
eg:        DataView dv = dt.DefaultView;
        dv.Sort = orderByName+" "+ orderByType;
4.向上向下的箭頭也可以換成圖片，webdings字體應該速度更快。
效果如下：