利用ViewState和DataTable動態錄入資料

阿新 • • 發佈：2019-01-24

<%@ Page Language="C#" EnableViewState="true" %>  
  
<%@ Import Namespace="System.Data" %>  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"  
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<script runat="server">  
  private DataTable stoveTable = null;  
  protected void Page_Load(object sender, EventArgs e)  
  {  
    if (!Page.IsPostBack)  
    {  
      //建立 EmptyDataTemplate  
      this.GridView_list.DataBind();  
    }  
  }  
  
  protected void GridView_list_RowDataBound(object sender, GridViewRowEventArgs e)  
  {  
    if (e.Row.RowType == DataControlRowType.DataRow)  
    {  
      String usage = DataBinder.Eval(e.Row.DataItem, "usage").ToString();  
      String steelKind = DataBinder.Eval(e.Row.DataItem, "steelKind").ToString();  
      String castingTon = DataBinder.Eval(e.Row.DataItem, "castingTon").ToString();  
      DropDownList x1 = e.Row.FindControl("x1") as DropDownList;  
      DropDownList x2 = e.Row.FindControl("x2") as DropDownList;  
      TextBox x3 = e.Row.FindControl("x3") as TextBox;  
      x3.Text = castingTon;  
      ListItem xx1 = x1.Items.FindByValue(usage);  
      if (xx1 != null) xx1.Selected = true;  
      ListItem xx2 = x2.Items.FindByValue(steelKind);  
      if (xx2 != null) xx2.Selected = true;  
    }  
  }  
  
  protected void LinkButton1_Click(object sender, EventArgs e)  
  {  
    DropDownList x1, x2;  
    TextBox x3;  
    if (GridView_list.Rows.Count == 0)  
    {  
      x1 = GridView_list.Controls[0].Controls[0].FindControl("x1") as DropDownList;  
      x2 = GridView_list.Controls[0].Controls[0].FindControl("x2") as DropDownList;  
      x3 = GridView_list.Controls[0].Controls[0].FindControl("x3") as TextBox;  
    }  
    else  
    {  
      GridViewRow r = GridView_list.FooterRow;  
      x1 = r.FindControl("x1") as DropDownList;  
      x2 = r.FindControl("x2") as DropDownList;  
      x3 = r.FindControl("x3") as TextBox;  
    }  
    if (ViewState["dt"] == null)  
    {  
      stoveTable = new DataTable();  
      stoveTable.Columns.Add("usage", typeof(String));  
      stoveTable.Columns.Add("steelKind", typeof(String));  
      stoveTable.Columns.Add("castingTon", typeof(String));  
    }  
    else  
    {  
      stoveTable = (DataTable)ViewState["dt"];  
    }  
    DataRow newRow = stoveTable.NewRow();  
    newRow["usage"] = x1.SelectedValue;  
    newRow["steelKind"] = x2.SelectedValue;  
    newRow["castingTon"] = x3.Text;  
    stoveTable.Rows.Add(newRow);  
  
    ViewState["dt"] = stoveTable;  
    this.GridView_list.DataSource = stoveTable;  
    this.GridView_list.DataBind();  
  
  }  
  protected void LinkButton2_Click(object sender, EventArgs e)  
  {  
    if (ViewState["dt"] == null)  
    {  
      return;  
    }  
    stoveTable = (DataTable)ViewState["dt"];  
    if (stoveTable.Rows.Count < 1) return;  
    stoveTable.Rows.RemoveAt(stoveTable.Rows.Count - 1);  
    ViewState["dt"] = stoveTable;  
    this.GridView_list.DataSource = stoveTable;  
    this.GridView_list.DataBind();  
  }  
  
  protected void x1_SelectedIndexChanged(object sender, EventArgs e)  
  {  
    DropDownList x1 = sender as DropDownList;  
    GridViewRow r = x1.Parent.Parent as GridViewRow;  
    if (ViewState["dt"] == null)  
    {  
      Response.Write("Error");  
      return;  
    }  
    stoveTable = (DataTable)ViewState["dt"];  
    stoveTable.Rows[r.RowIndex]["usage"] = x1.SelectedValue;  
    ViewState["dt"] = stoveTable;  
    this.GridView_list.DataSource = stoveTable;  
    this.GridView_list.DataBind();  
  }  
  
  protected void x2_SelectedIndexChanged(object sender, EventArgs e)  
  {  
    DropDownList x2 = sender as DropDownList;  
    GridViewRow r = x2.Parent.Parent as GridViewRow;  
    if (ViewState["dt"] == null)  
    {  
      Response.Write("Error");  
      return;  
    }  
    stoveTable = (DataTable)ViewState["dt"];  
    stoveTable.Rows[r.RowIndex]["steelKind"] = x2.SelectedValue;  
    ViewState["dt"] = stoveTable;  
    this.GridView_list.DataSource = stoveTable;  
    this.GridView_list.DataBind();  
  }  
  
  protected void x3_TextChanged(object sender, EventArgs e)  
  {  
  
    TextBox x3 = sender as TextBox;  
    GridViewRow r = x3.Parent.Parent as GridViewRow;  
    if (ViewState["dt"] == null)  
    {  
      Response.Write("Error");  
      return;  
    }  
    stoveTable = (DataTable)ViewState["dt"];  
    stoveTable.Rows[r.RowIndex]["castingTon"] = x3.Text;  
    ViewState["dt"] = stoveTable;  
    this.GridView_list.DataSource = stoveTable;  
    this.GridView_list.DataBind();  
  }  
</script>

<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
  <title></title>  
</head>  
<body>  
  <form id="form1" runat="server">  
  <asp:GridView ID="GridView_list" runat="server" ShowFooter="true" AutoGenerateColumns="false"  
    OnRowDataBound="GridView_list_RowDataBound">  
    <EmptyDataTemplate>  
      <table style="border-collapse: collapse; width: 100%" cellspacing="0" rules="all"  
        border="1">  
        <tr>  
          <th scope="col">  
            選擇1  
          </th>  
          <th scope="col">  
            選擇2  
          </th>  
          <th scope="col">  
            輸入文字  
          </th>  
        </tr>  
        <tr><td>  
          <asp:DropDownList ID="x1" runat="server">  
            <asp:ListItem>L0</asp:ListItem>  
            <asp:ListItem>L1</asp:ListItem>  
            <asp:ListItem>L2</asp:ListItem>  
            <asp:ListItem>L3</asp:ListItem>  
          </asp:DropDownList>  
        </td><td>  
          <asp:DropDownList ID="x2" runat="server">  
            <asp:ListItem>10#</asp:ListItem>  
            <asp:ListItem>20#</asp:ListItem>  
            <asp:ListItem>30#</asp:ListItem>  
            <asp:ListItem>40#</asp:ListItem>  
          </asp:DropDownList>  
        </td><td>  
          <asp:TextBox ID="x3" runat="server"></asp:TextBox>  
        </td></tr>  
      </table>  
    </EmptyDataTemplate>  
    <Columns>  
      <asp:TemplateField HeaderText="選擇1">  
        <ItemTemplate>  
          <asp:DropDownList ID="x1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="x1_SelectedIndexChanged">  
            <asp:ListItem>L0</asp:ListItem>  
            <asp:ListItem>L1</asp:ListItem>  
            <asp:ListItem>L2</asp:ListItem>  
            <asp:ListItem>L3</asp:ListItem>  
          </asp:DropDownList>  
        </ItemTemplate>  
        <FooterTemplate>  
          <asp:DropDownList ID="x1" runat="server">  
            <asp:ListItem>L0</asp:ListItem>  
            <asp:ListItem>L1</asp:ListItem>  
            <asp:ListItem>L2</asp:ListItem>  
            <asp:ListItem>L3</asp:ListItem>  
          </asp:DropDownList>  
        </FooterTemplate>  
      </asp:TemplateField>  
      <asp:TemplateField HeaderText="選擇2">  
        <ItemTemplate>  
          <asp:DropDownList ID="x2" runat="server" AutoPostBack="true" OnSelectedIndexChanged="x2_SelectedIndexChanged">  
            <asp:ListItem>10#</asp:ListItem>  
            <asp:ListItem>20#</asp:ListItem>  
            <asp:ListItem>30#</asp:ListItem>  
            <asp:ListItem>40#</asp:ListItem>  
          </asp:DropDownList>  
        </ItemTemplate>  
        <FooterTemplate>  
          <asp:DropDownList ID="x2" runat="server">  
            <asp:ListItem>10#</asp:ListItem>  
            <asp:ListItem>20#</asp:ListItem>  
            <asp:ListItem>30#</asp:ListItem>  
            <asp:ListItem>40#</asp:ListItem>  
          </asp:DropDownList>  
        </FooterTemplate>  
      </asp:TemplateField>  
      <asp:TemplateField HeaderText="輸入文字">  
        <ItemTemplate>  
          <asp:TextBox ID="x3" runat="server" AutoPostBack="true" OnTextChanged="x3_TextChanged"></asp:TextBox>  
        </ItemTemplate>  
        <FooterTemplate>  
          <asp:TextBox ID="x3" runat="server"></asp:TextBox>  
        </FooterTemplate>  
      </asp:TemplateField>  
    </Columns>  
  </asp:GridView>  
  <asp:LinkButton ID="LinkButton1" runat="server" Text="新增內容" OnClick="LinkButton1_Click"></asp:LinkButton>  
  <asp:LinkButton ID="LinkButton2" runat="server" Text="刪除內容" OnClick="LinkButton2_Click"></asp:LinkButton>  
  </form>  
</body>  
</html>

另外一種方法：

<%@ Page Language="C#" AutoEventWireup="true" EnableViewState="true" %>  
<%@ Import Namespace="System.Data" %>  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"  
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<script runat="server">  
  private DataTable dataTable = null;  
  protected void Page_Load(object sender, EventArgs e)  
  {  
    if (!Page.IsPostBack)  
    {  
      this.Bind(true);  
    }  
  }  
  
  private DataTable GetDataTable()  
  {  
    if (ViewState["dt"] == null)  
    {  
      dataTable = new DataTable();  
      dataTable.Columns.Add("usage", typeof(String));  
      dataTable.Columns.Add("steelKind", typeof(String));  
      dataTable.Columns.Add("castingTon", typeof(String));  
      return dataTable;  
    }  
    else  
    {  
      return ViewState["dt"] as DataTable;  
    }  
  }  
  
  private void Bind(bool AddBlankRow)  
  {  
    dataTable = GetDataTable();  
    if (AddBlankRow) dataTable.Rows.Add(dataTable.NewRow());  
    this.GridView1.DataSource = dataTable;  
    this.GridView1.DataBind();  
  }  
  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)  
  {  
    if (e.Row.RowType == DataControlRowType.DataRow)  
    {  
      DropDownList x1 = e.Row.FindControl("x1") as DropDownList;  
      DropDownList x2 = e.Row.FindControl("x2") as DropDownList;  
      TextBox x3 = e.Row.FindControl("x3") as TextBox;  
  
      String usage = DataBinder.Eval(e.Row.DataItem, "usage").ToString();  
      String steelKind = DataBinder.Eval(e.Row.DataItem, "steelKind").ToString();  
      String castingTon = DataBinder.Eval(e.Row.DataItem, "castingTon").ToString();  
  
      x3.Text = castingTon;  
      ListItem xx1 = x1.Items.FindByValue(usage);  
      if (xx1 != null) xx1.Selected = true;  
      ListItem xx2 = x2.Items.FindByValue(steelKind);  
      if (xx2 != null) xx2.Selected = true;  
    }  
  }  
  
  protected void LinkButton1_Click(object sender, EventArgs e)  
  {  
    //總是取最後的一行  
    GridViewRow row = GridView1.Rows[GridView1.Rows.Count - 1];  
    DropDownList x1 = row.FindControl("x1") as DropDownList;  
    DropDownList x2 = row.FindControl("x2") as DropDownList;  
    TextBox x3 = row.FindControl("x3") as TextBox;  
  
    dataTable = this.GetDataTable();  
    DataRow newRow = dataTable.NewRow();  
    if (dataTable.Rows.Count > 0)  
    {  
      newRow = dataTable.Rows[dataTable.Rows.Count - 1];  
    }  
  
    newRow["usage"] = x1.SelectedValue;  
    newRow["steelKind"] = x2.SelectedValue;  
    newRow["castingTon"] = x3.Text;  
    if (dataTable.Rows.Count == 0)  
    {  
      dataTable.Rows.Add(newRow);  
    }  
  
    ViewState["dt"] = dataTable;  
    this.Bind(true);  
  
  }  
  protected void LinkButton2_Click(object sender, EventArgs e)  
  {  
    dataTable = this.GetDataTable();  
    if (dataTable.Rows.Count < 1) return;  
    dataTable.Rows.RemoveAt(dataTable.Rows.Count - 1);  
    ViewState["dt"] = dataTable;  
    this.Bind(false);  
  }  
  
  protected void x1_SelectedIndexChanged(object sender, EventArgs e)  
  {  
    DropDownList x1 = sender as DropDownList;  
    GridViewRow r = x1.Parent.Parent as GridViewRow;  
    dataTable = this.GetDataTable();  
    dataTable.Rows[r.RowIndex]["usage"] = x1.SelectedValue;  
    ViewState["dt"] = dataTable;  
    this.Bind(false);  
  }  
  
  protected void x2_SelectedIndexChanged(object sender, EventArgs e)  
  {  
    DropDownList x2 = sender as DropDownList;  
    GridViewRow r = x2.Parent.Parent as GridViewRow;  
    dataTable = this.GetDataTable();  
    dataTable.Rows[r.RowIndex]["steelKind"] = x2.SelectedValue;  
    ViewState["dt"] = dataTable;  
    this.Bind(false);  
  }  
  
  protected void x3_TextChanged(object sender, EventArgs e)  
  {  
    TextBox x3 = sender as TextBox;  
    GridViewRow r = x3.Parent.Parent as GridViewRow;  
    dataTable = this.GetDataTable();  
    dataTable.Rows[r.RowIndex]["castingTon"] = x3.Text;  
    ViewState["dt"] = dataTable;  
    this.Bind(false);  
  }  
  
  protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)  
  {  
    if (e.Row.RowType == DataControlRowType.DataRow)  
    {  
      if (e.Row.RowIndex < this.GetDataTable().Rows.Count - 1)  
      {  
        DropDownList x1 = e.Row.FindControl("x1") as DropDownList;  
        DropDownList x2 = e.Row.FindControl("x2") as DropDownList;  
        TextBox x3 = e.Row.FindControl("x3") as TextBox;  
        x1.AutoPostBack = x2.AutoPostBack = x3.AutoPostBack = true;  
        x1.SelectedIndexChanged += new EventHandler(x1_SelectedIndexChanged);  
        x2.SelectedIndexChanged += new EventHandler(x2_SelectedIndexChanged);  
        x3.TextChanged += new EventHandler(x3_TextChanged);  
      }  
    }  
  }  
</script>

<html xmlns="http://www.w3.org/1999/xhtml">  
<head id="Head1" runat="server">  
  <title></title>  
</head>  
<body>  
  <form id="form1" runat="server">  
  <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" OnRowDataBound="GridView1_RowDataBound"  
    OnRowCreated="GridView1_RowCreated">  
    <Columns>  
      <asp:TemplateField HeaderText="選擇1">  
        <ItemTemplate>  
          <asp:DropDownList ID="x1" runat="server">  
            <asp:ListItem>L0</asp:ListItem>  
            <asp:ListItem>L1</asp:ListItem>  
            <asp:ListItem>L2</asp:ListItem>  
            <asp:ListItem>L3</asp:ListItem>  
          </asp:DropDownList>  
        </ItemTemplate>  
      </asp:TemplateField>  
      <asp:TemplateField HeaderText="選擇2">  
        <ItemTemplate>  
          <asp:DropDownList ID="x2" runat="server">  
            <asp:ListItem>10#</asp:ListItem>  
            <asp:ListItem>20#</asp:ListItem>  
            <asp:ListItem>30#</asp:ListItem>  
            <asp:ListItem>40#</asp:ListItem>  
          </asp:DropDownList>  
        </ItemTemplate>  
      </asp:TemplateField>  
      <asp:TemplateField HeaderText="輸入文字">  
        <ItemTemplate>  
          <asp:TextBox ID="x3" runat="server"></asp:TextBox>  
        </ItemTemplate>  
      </asp:TemplateField>  
    </Columns>  
  </asp:GridView>  
  <asp:LinkButton ID="LinkButton1" runat="server" Text="新增內容" OnClick="LinkButton1_Click"></asp:LinkButton>  
  <asp:LinkButton ID="LinkButton2" runat="server" Text="刪除內容" OnClick="LinkButton2_Click"></asp:LinkButton>  
  </form>  
</body>  
</html>

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