ListBox 複選 左右移動 & 上下移動 LINQ應用

.aspx
<table border="0" cellpadding="0" cellspacing="0" width="50">
<tr>
    <td style="width: 35%">
        <asp:ListBox ID="LB_LIST1" runat="server" SelectionMode="Multiple"
            Width="100px" Height="150px">
            <asp:ListItem>Item 1.</asp:ListItem>
            <asp:ListItem>Item 2.</asp:ListItem>
            <asp:ListItem>Item 3.</asp:ListItem>
            <asp:ListItem>Item 4.</asp:ListItem>
            <asp:ListItem>Item 5.</asp:ListItem>
            <asp:ListItem>Item 6.</asp:ListItem>
            <asp:ListItem>Item 7.</asp:ListItem>
            <asp:ListItem>Item 8.</asp:ListItem>
            <asp:ListItem>Item 9.</asp:ListItem>
            <asp:ListItem>Item 10.</asp:ListItem>
        </asp:ListBox>
    </td>
    <td style="width: 15%">
        <asp:Button ID="BT_RightAll" runat="server" Text="→|" CommandName="RightAll"
            oncommand="ListBox_Change_Command" Width="30px" /><br />
        <asp:Button ID="BT_Right" runat="server" Text="→" CommandName="Right"
            oncommand="ListBox_Change_Command" Width="30px" /><br />
        <asp:Button ID="BT_Left" runat="server" Text="←" CommandName="Left"
            oncommand="ListBox_Change_Command" Width="30px" />
        <asp:Button ID="BT_LeftAll" runat="server" Text="|←" CommandName="LeftAll"
            oncommand="ListBox_Change_Command" Width="30px" />
    </td>
    <td style="width: 35%">
        <asp:ListBox ID="LB_LIST2" runat="server" SelectionMode="Multiple"
            Width="100px" Height="150px"></asp:ListBox>
    </td>
    <td style="width: 15%">
        <asp:Button ID="LB_Up" runat="server" Text="↑" CommandName="Up"
            oncommand="ListBox_Change_Command" Width="30px" /><br />
        <asp:Button ID="LB_Down" runat="server" Text="↓" CommandName="Down"
            oncommand="ListBox_Change_Command" Width="30px" />
    </td>
</tr>
</table>


.cs
    protected void ListBox_Change_Command(object sender, CommandEventArgs e)
    {
        String strTempText = String.Empty;
        String strTempValue = String.Empty;

        try
        {
            switch (e.CommandName)
            {
                // 移動到右邊
                case "Right":
                    LB_LIST2.Items.AddRange(
                        (from ListItem LI in LB_LIST1.Items where LI.Selected select LI).ToArray<ListItem>());

                    for (int i = 0; i < LB_LIST1.Items.Count; i++)
                    {
                        if (LB_LIST1.Items[i].Selected)
                        {
                            LB_LIST1.Items.RemoveAt(i);
                            i--;
                        }
                    }
                    break;
                // 全部移動到右邊
                case "RightAll":
                    LB_LIST2.Items.AddRange(
                        (from ListItem LI in LB_LIST1.Items select LI).ToArray<ListItem>());
                    for (int i = 0; i < LB_LIST1.Items.Count; i++)
                    {
                        LB_LIST1.Items.RemoveAt(i);
                        i--;
                    }
                    break;
                // 移動到左邊
                case "Left":
                    LB_LIST1.Items.AddRange(
                        (from ListItem LI in LB_LIST2.Items where LI.Selected select LI).ToArray<ListItem>());

                    for (int i = 0; i < LB_LIST2.Items.Count; i++)
                    {
                        if (LB_LIST2.Items[i].Selected)
                        {
                            LB_LIST2.Items.RemoveAt(i);
                            i--;
                        }
                    }
                    break;
                // 全部移動到左邊
                case "LeftAll":
                    LB_LIST1.Items.AddRange(
                        (from ListItem LI in LB_LIST2.Items select LI).ToArray<ListItem>());
                    for (int i = 0; i < LB_LIST2.Items.Count; i++)
                    {
                        LB_LIST2.Items.RemoveAt(i);
                        i--;
                    }
                    break;
                // 往上移動
                case "Up":
                    for (int i = 0; i < LB_LIST2.Items.Count; i++)
                    {
                        if (LB_LIST2.Items[i].Selected && !i.Equals(0))
                        {
                            strTempText = LB_LIST2.Items[i - 1].Text;
                            strTempValue = LB_LIST2.Items[i - 1].Value;
                            LB_LIST2.Items[i - 1].Text = LB_LIST2.Items[i].Text;
                            LB_LIST2.Items[i - 1].Value = LB_LIST2.Items[i].Value;
                            LB_LIST2.Items[i].Text = strTempText;
                            LB_LIST2.Items[i].Value = strTempValue;
                            LB_LIST2.Items[i - 1].Selected = true;
                            LB_LIST2.Items[i].Selected = false;
                        }
                    }
                    break;
                // 往下移動
                case "Down":
                    for (int i = LB_LIST2.Items.Count - 1; i >= 0; i--)
                    {
                        if (LB_LIST2.Items[i].Selected && !i.Equals(LB_LIST2.Items.Count - 1))
                        {
                            strTempText = LB_LIST2.Items[i + 1].Text;
                            strTempValue = LB_LIST2.Items[i + 1].Value;
                            LB_LIST2.Items[i + 1].Text = LB_LIST2.Items[i].Text;
                            LB_LIST2.Items[i + 1].Value = LB_LIST2.Items[i].Value;
                            LB_LIST2.Items[i].Text = strTempText;
                            LB_LIST2.Items[i].Value = strTempValue;
                            LB_LIST2.Items[i + 1].Selected = true;
                            LB_LIST2.Items[i].Selected = false;
                        }
                    }


                    break;
            }
        }
        catch { }

    }



原始文章出自於此