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Question

我在gridview中有一个wpf组合框，它有dataview作为绑定源。组合框填充值，但在加载组合框时，所选项始终为空。

组合框绑定的对象：

public class ChargeCodeValidValues
{
    #region Properties

    public DataTable ChargeCodesValidValuesTable { get; set; }
    public DataView dvChargeCodeValidValues { get; set; }
     #region Properties

    //public int Id { get; set; }
    //public int Code { get; set; }
    //public string Description { get; set; }



    #endregion

   // public ChargeCodeValidValue() { }

    //public ChargeCodeValidValue(DataRow dr)
    //{
    //    Id = dr.Field<int>("Id");
    //    Code = dr.Field<int>("Code");
    //    Description = dr.Field<string>("Description");

    //}

    #endregion
    #region Constructor

    public ChargeCodeValidValues()
    {
        LoadChargeCodesValidValues();
    }

    public void LoadChargeCodesValidValues()
    {
        Database db = new Database();
        DataTable dataTable = db.ExecuteQuery("upGet_ChargeCodesValidValues", "ChargeCodesValidValues", "ID");

        this.ChargeCodesValidValuesTable = dataTable;
        this.dvChargeCodeValidValues = ChargeCodesValidValuesTable.DefaultView;


    }




    //public static void GetChargeCodeValidValues()
    //{
    //    Database db = new Database();
    //    DataTable dataTable = db.ExecuteQuery("upGet_ChargeCodesValidValues", "ChargeCodesValidValues", "ID");           
    //}

    #endregion
}

public class ChargeCodeValidValue
{
    #region Properties

    public int Id { get; set; }
    public int Code { get; set; }
    public string Description { get; set; }



    #endregion

    public ChargeCodeValidValue() { }

    public ChargeCodeValidValue(DataRow dr)
    {
        Id = dr.Field<int>("Id");
        Code = dr.Field<int>("Code");
        Description = dr.Field<string>("Description");

    }

    public  void LoadChargeCodeValidValue(DataRow dr)
    {
        Id = dr.Field<int>("Id");
        Code = dr.Field<int>("Code");
        Description = dr.Field<string>("Description");

    }
}

XAML：

<DataTemplate x:Key="combodescriptionTemplate">
                                <ComboBox
                                     Name="cboCombo"
                                    ItemsSource="{Binding dvChargeCodeValidValues}"
                                    DisplayMemberPath="Description"
                                     SelectedItem="Description"
                                     >                                    
                                    <ComboBox.DataContext>
                                        <Objects:ChargeCodeValidValues/>
                                    </ComboBox.DataContext>
                                </ComboBox>
                            </DataTemplate>
                            <local:TotalCellTemplateSelector x:Key="totalcellTemplateSelector"                                                             
                                combodescriptionTemplate="{StaticResource combodescriptionTemplate}"/>

gridview专栏：

<dxg:GridColumn Header="Description" FieldName="Description" Width="Auto" MinWidth="132" AllowMoving="False" CellTemplateSelector="{StaticResource totalcellTemplateSelector}" /> -->

此列默认为文本框。它会根据其他列的值

更改为组合框

Combobox所选项目始终为空。我知道这是一个具有约束力的问题，但我无法弄明白，我是wpf的新手。

有人可以帮忙吗