Question

我有一个班级：

public class CustomInvoice
    {
        public string InvoiceId { get; set; }
        public string Date { get; set; }
        public string RecpDate { get; set; }
        public string Category { get; set; }
        public string TotalValue { get; set; }
        public string InvoiceRef { get; set; }
        public string Client { get; set; }
        public string Status { get; set; }
    }

我用数据填充此类，然后将其绑定到gridview：

List<CustomInvoice> invoices = GetInvoices(url);
InvoiceGrid.DataSource = invoices;         
InvoiceGrid.DataBind();

这会正确显示所有信息，但现在我希望能够对其进行排序，因此我添加了一个按钮，其中包含以下方法：

    protected void Button1_Click(object sender, EventArgs e)
    {
        string expression = "InvoiceId";
        SortDirection direction = SortDirection.Ascending;

        InvoiceGrid.Sort(expression,direction);
    }

我也改变了它的html以允许排序：

<asp:GridView ID="InvoiceGrid" runat="server" AllowSorting="True" OnSorting="gridView_Sorting"></asp:GridView>

然而，当这次运行时，我得到以下异常

System.Web.HttpException (0x80004005): The GridView 'InvoiceGrid' fired event Sorting which wasn't handled.\r\n

有人能告诉我如何使用按钮的onclick对我的gridview进行排序吗？

谢谢：）

编辑：

我尝试将其添加到列标题中（忽略按钮）

protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
        {
            DataTable dataTable = InvoiceGrid.DataSource as DataTable;
            DataView dataView = new DataView(dataTable);
            dataView.Sort = e.SortExpression + " " + e.SortDirection;

            InvoiceGrid.DataSource = dataView;
            InvoiceGrid.DataBind();
        }

然而，问题是DataTable为null，即使我可以看到invoiceGrid有数据。

Answer 1

@hamed shams向我提到了这个问题的解决方案，那就是使用linq（我已经完全忘记了）。

所以我在引用customInvoice时使用linq：

var result = from i in invoices
            orderby i.Category ascending
            select i;

然后我将结果绑定到gridview：

InvoiceGrid.DataSource = result;
InvoiceGrid.DataBind();

Answer 2

请尝试以下方法：

protected void SearchResults_Sorting(object sender, GridViewSortEventArgs e)
{
    var searchedStudents = this.SearchResults();
    var sortedData = searchedStudents.DefaultView;
    var sortDirection = !this.SortDirections.ContainsKey(e.SortExpression) || !this.SortDirections[e.SortExpression] ? "desc" : "asc";
    var sortDirections = new Dictionary<string, bool>();
    sortDirections.Add(e.SortExpression, sortDirection == "desc");
    this.SortDirections = sortDirections;        
    sortedData.Sort = e.SortExpression + " " + sortDirection;
    this.SearchResults.DataSource = sortedData.ToTable();
    this.SearchResults.DataBind();
}

private Dictionary<string, bool> SortDirections
{
    get
    {
        var sortDirection = new Dictionary<string, bool>();
        if (this.ViewState["SortDirection"] != null)
        {
            sortDirection = (Dictionary<string, bool>)this.ViewState["SortDirection"];
        }

        return sortDirection;
    }
    set
    {
        this.ViewState["SortDirection"] = value;
    }

如果您有任何问题，请与我们联系。

如何对gridview进行排序？

2 个答案: