协助混合控制类型的SQLDataSource筛选

Question

我一直在研究数据源过滤，而页面应用程序的复杂性使我的逻辑陷入困境。

我有一个Gridview，它显示数据源中的3/17值。 我想针对数据源在3个下拉菜单和3个复选框上运行过滤器。 这三个DDL在索引0处的默认值为String.Empty，并在页面加载（！IsPostBack）时由另一个DS填充。

我的问题：

• 当页面加载时，gridview中没有任何内容。 空的DDL值应被跳过。
• 最后一个复选框应代表（Part_Catalog.PartCount> 0）是否。
• 当前，过滤器是在数据源中定义的，但是由于上述条件，我需要在cs文件中进行一些处理。 我不确定的是，是否需要将整个DS移至后面的代码，过滤器或仅过滤条件。

• 另外，我不确定要输入哪些事件。

   <asp:SqlDataSource ID="SqlDataSource1" runat="server" EnableCaching="true" DataSourceMode="DataSet" ConnectionString="<%$ ConnectionStrings:inventory_v2ConnectionString %>" SelectCommand="SELECT ID, OEMPartCode, PartCode2, UsedByOEM, ItemType, GroupType, PartCount, PartDesc, PartComment, PartMin, PartActive, MFRPartNumber, PartCapacity, PreTurnRequired, AssemblyPart, PartImage, PartImage2, NonInventoryPart FROM dbo.Part_Catalog" FilterExpression="UsedByOEM = '{0}' AND ItemType = '{1}' AND GroupType = '{2}' OR (UsedByOEM = '{0}' OR ItemType = '{1}' OR GroupType = '{2}') OR (UsedByOEM = '{0}' OR ItemType = '{1}' AND GroupType = '{2}') OR (UsedByOEM = '{0}' AND ItemType = '{1}' OR GroupType = '{2}')"> <FilterParameters> <asp:ControlParameter Name="UsedByOEM" ControlID="DDL_OEM" PropertyName="SelectedValue" /> <asp:ControlParameter Name="ItemType" ControlID="DDL_ItemTypes" PropertyName="SelectedValue" /> <asp:ControlParameter Name="GroupType" ControlID="DDL_GroupTypes" PropertyName="SelectedValue" /> </FilterParameters> </asp:SqlDataSource> <asp:DropDownList ID="DDL_OEM" runat="server" AutoPostBack="True" AppendDataBoundItems="True"></asp:DropDownList> <asp:DropDownList ID="DDL_ItemTypes" runat="server" AutoPostBack="True" AppendDataBoundItems="True"></asp:DropDownList> <asp:DropDownList ID="DDL_GroupTypes" runat="server" AutoPostBack="True" AppendDataBoundItems="True"></asp:DropDownList> <asp:CheckBox ID="CheckBox1" runat="server" Checked="True" /> <asp:CheckBox ID="CheckBox2" runat="server" /> <asp:CheckBox ID="CheckBox3" runat="server" Checked="True" /> protected void BindOEMs() { SqlConnection connectionString = new SqlConnection(ConfigurationManager.ConnectionStrings["inventory_v2ConnectionString"].ConnectionString); connectionString.Open(); SqlCommand cmd = new SqlCommand("SELECT [Manufacturer], [ID] FROM [Models_OEMs] ORDER BY [Manufacturer]", connectionString); SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); connectionString.Close(); DDL_OEM.DataSource = ds; DDL_OEM.DataTextField = "Manufacturer"; DDL_OEM.DataValueField = "ID"; DDL_OEM.DataBind(); DDL_OEM.Items.Insert(0, new ListItem(String.Empty, "0")); } 

Answer 1

现在想通了。 我将以下行添加到page_load（！isPostBack），因此过滤器在首次加载时适用。

if (gvFilter.OEM == null || gvFilter.OEM == 0 ) { Filter_DataSet(null, null); }

用我的类别创建了一个自定义Filter对象：

 public class Filters
{
    private int oem;
    private int item;
    private int group;
    private bool active;
    private bool ninventoried;
    private bool stocked;

    public int OEM
    {
        set { oem = value; }
        get { return oem; }
    }
    public int Item
    {
        set { item = value; }
        get { return item; }
    }
    public int Group
    {
        set { group = value; }
        get { return group; }
    }
    public bool Active
    {
        set { active = value; }
        get { return active; }
    }
    public bool Ninventoried
    {
        set { ninventoried = value; }
        get { return ninventoried; }
    }
    public bool Stocked
    {
        set { stocked = value; }
        get { return stocked; }
    }

}

然后，我创建了一种将过滤器应用于数据源的方法，并将所有过滤器控件事件设置为此方法：

protected void Filter_DataSet(object sender, EventArgs e)
{
    DetailsView1.Visible = false;
    string FEString= String.Empty;
    gvFilter.OEM = Convert.ToInt32(DDL_OEM.SelectedValue);
    gvFilter.Item = Convert.ToInt32(DDL_ItemTypes.SelectedValue);
    gvFilter.Group = Convert.ToInt32(DDL_GroupTypes.SelectedValue);
    if (CheckBox1.Checked == true) { gvFilter.Active = true; } else { gvFilter.Active = false; }
    if (CheckBox2.Checked == true) { gvFilter.Ninventoried = true; } else { gvFilter.Ninventoried = false; }
    if (CheckBox3.Checked == true) { gvFilter.Stocked = true; } else { gvFilter.Stocked = false; }

    if (gvFilter.OEM >0)
    {
        FEString += "UsedByOEM = " + gvFilter.OEM.ToString(); 
    }
    if (gvFilter.Item > 0)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "ItemType = " + gvFilter.Item.ToString();
    }
    if (gvFilter.Group > 0)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "GroupType = " + gvFilter.Group.ToString();
    }
    if (gvFilter.Active == true)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "PartActive = " + gvFilter.Active.ToString();
    }
    if (gvFilter.Active == false)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "PartActive = " + gvFilter.Active.ToString();
    }
    if (gvFilter.Ninventoried == true)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "NonInventoryPart = " + gvFilter.Ninventoried.ToString();
    }
    if (gvFilter.Ninventoried == false)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "NonInventoryPart = " + gvFilter.Ninventoried.ToString();
    }
    if (gvFilter.Stocked == true)
    {
        if (FEString.Length > 0) { FEString += " AND "; }
        FEString += "PartCount > 0 ";
    }
    //if (gvFilter.Stocked == false)
    //{
    //    if (FEString.Length > 0) { FEString += " AND "; }
    //    FEString += "PartCount <= 0 ";
    //}
    SqlDataSource1.FilterExpression = FEString;
}