将Devexpress控件绑定到嵌套属性

Question

这个问题由朋友问我，我也无法解决。使用EF6和devexpress winform组件的示例代码。

我创建了包含2列的LookupEditControl。

       var cities = context.Cities.Include(p=>p.Country)
            .OrderBy(e => e.City.Name)
            .OrderBy(e=>e.CountryISOCode)
            .ToList();

        //countryLookUpEdit.Properties.DataSource = cities;

        countryLookUpEdit.Properties.DisplayMember = "Name";
        countryLookUpEdit.Properties.ValueMember = "ID";           

        countryLookUpEdit.Properties.Columns.Clear();

        // this column always empty, but Console.WriteLine dumps it
        countryLookUpEdit.Properties.Columns.Add(new LookUpColumnInfo("Country.Name", "Country Name", 225));

        // this column works
        countryLookUpEdit.Properties.Columns.Add(new LookUpColumnInfo("Name", "City Name", 150));

        countryLookUpEdit.Properties.DataSource = cities;

查看最后3行代码。列限制为＆＃34; Country.Name＆＃34;总是空的。但其他人也可以。

如何将LookupEditControls列绑定到业务对象的嵌套属性？

Answer 1

相对于following DevExpress Support ticket，LookupEdit中不支持嵌套属性 但我相信您可以使用GridLookupEdit代替：

gridLookUpEdit.Properties.DisplayMember = "Name";
gridLookUpEditView.Columns.Add(
    new GridColumn() { FieldName = "Name", Visible = true });
gridLookUpEditView.Columns.Add(
    new GridColumn() { FieldName = "Country.Name", Caption = "Country", Visible = true });
gridLookUpEdit.Properties.DataSource = new List<City> { 
    new City() { Name="New York", Country = new Country() { Name = "USA" } },
    new City() { Name="London", Country = new Country() { Name = "UK" } },
};