Question

我知道有很多关于这个主题的帖子，但它们似乎都没有帮助解决我的问题。

点击标题标题时，我正在尝试对gridview进行排序我通过搜索这里和其他网站找到了一些解决方案。但它似乎没有做到这一点我希望有人可以告诉我，如果我错过了什么或问题是什么，因为什么都没发生，我真的不知道问题是什么。

我的网格视图：

       <asp:GridView ID="GridView1" AllowSorting="true" OnSorting="GridView1_Sorting" runat="server" HeaderStyle-BackColor="#ffffff" HeaderStyle-ForeColor="black"
RowStyle-BackColor="#F2EFDF" AlternatingRowStyle-BackColor="White" AlternatingRowStyle-ForeColor="#000"
AutoGenerateColumns="false" CellPadding="5">
<Columns>
    <asp:BoundField DataField="Filename" HeaderText="Filnavn">
        <ItemStyle Width="150px"></ItemStyle>
    </asp:BoundField>
    <asp:BoundField DataField="Time" HeaderText="Uploadet"/>
    <asp:TemplateField ItemStyle-HorizontalAlign = "Center">
        <ItemTemplate>
            <asp:LinkButton ID="lnkDownload" runat="server" Text="Download" OnClick="DownloadFile"
                CommandArgument='<%# Eval("Id") %>'></asp:LinkButton>
        </ItemTemplate>
    </asp:TemplateField>
</Columns>

背后的代码：

        public string SortingExpression
{
    get
    {
        if (this.ViewState["SortExpression"] == null)
            return "";
        else
            return (string)this.ViewState["SortExpression"];
    }

    set
    {
        this.ViewState["SortExpression"] = value;
    }
}

protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
    DataTable m_DataTable = GridView1.DataSource as DataTable;

    if (m_DataTable != null)
    {
        DataView m_DataView = new DataView(m_DataTable);
        SortingExpression = e.SortExpression + " " + (SortingExpression.Contains("ASC") ? "DESC" : "ASC");
        m_DataView.Sort = SortingExpression;

        GridView1.DataSource = m_DataView;
        GridView1.DataBind();
    }
}

gridview数据来自数据表也许这就是问题？

Answer 1

添加SorteEpression =＆＃34; ColumnName＆＃34;在你的绑定字段中。

<Columns>
<asp:BoundField DataField="Filename" HeaderText="Filnavn" SortExpression="Filename">
    <ItemStyle Width="150px"></ItemStyle>
</asp:BoundField>
<asp:BoundField DataField="Time" HeaderText="Uploadet" SortExpression="Time"/>
<asp:TemplateField ItemStyle-HorizontalAlign = "Center">
    <ItemTemplate>
        <asp:LinkButton ID="lnkDownload" runat="server" Text="Download" OnClick="DownloadFile"
            CommandArgument='<%# Eval("Id") %>'></asp:LinkButton>
    </ItemTemplate>
</asp:TemplateField>

Answer 2

问题出在分类时创建的数据表中：

      protected void GridView1_Sorting(object sender, GridViewSortEventArgs e){
DataTable m_DataTable = GridView1.DataSource as DataTable;

if (m_DataTable != null)
{
    DataView m_DataView = new DataView(m_DataTable);
    SortingExpression = e.SortExpression + " " + (SortingExpression.Contains("ASC") ? "DESC" : "ASC");
    m_DataView.Sort = SortingExpression;

    GridView1.DataSource = m_DataView;
    GridView1.DataBind();
}}

出于某种原因，“Gridview1.Datasource”显示为null。哪个没有发生的原因。我最终解决了这个问题：

       DataTable m_DataTable = new DataTable();

        string theMagicWord = Request["k"];

        using (SqlConnection con = new SqlConnection("Connection information"))
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                cmd.CommandText = "select mBank_file.Id, mBank_file.Filename, CONVERT(varchar, mBank_file.TimeUploaded, 105) AS Time from mBank_file INNER JOIN mBank_keywords ON mBank_file.Id = mBank_keywords.fileId WHERE mBank_keywords.Keyword = @key ";
                cmd.Parameters.AddWithValue("@key", theMagicWord);
                cmd.Connection = con;
                con.Open();
                var dataReader = cmd.ExecuteReader();
                m_DataTable.Load(dataReader);
                con.Close();
            }
        }
        if (m_DataTable != null)
    {
        DataView m_DataView = new DataView(m_DataTable);
        SortingExpression = e.SortExpression + " " + (SortingExpression.Contains("ASC") ? "DESC" : "ASC");
        m_DataView.Sort = SortingExpression;

        GridView1.DataSource = m_DataView;
        GridView1.DataBind();
    }

通过再次从数据库中检索信息，它就像一个魅力。

排序gridview c＃没有任何反应

2 个答案: