Question

考虑以下

MODEL

public partial class ElementType
{
    public long ElementTypeId { get; set; }
    public LocalizedString TypeName { get; set; }
}

[ComplexType]
public class LocalizedString
{
    public string French { get; set; }
    public string English { get; set; }

    [NotMapped]
    public string Current
    {
        get { return (string) LanguageProperty().GetValue(this,null); }
        set { LanguageProperty().SetValue(this, value,null); }
    }

    public override string ToString()
    {
        return Current;
    }

    private PropertyInfo LanguageProperty()
    {
        string currentLanguage = Thread.CurrentThread.CurrentUICulture.DisplayName;
        return GetType().GetProperty(currentLanguage);
    }
}

CONTROLLER

public ActionResult ElementType_Read([DataSourceRequest]DataSourceRequest request)
{
    List<ElementType> elementTypeList = db.ElementType.ToList();
    IQueryable<ElementType> elementTypes = elementTypeList.AsQueryable();


    DataSourceResult result = elementTypes.ToDataSourceResult(request, elementType => new
    {
        ElementTypeId = elementType.ElementTypeId,
        TypeName = elementType.TypeName,
    });

    return Json(result);
}

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult ElementType_Destroy([DataSourceRequest]DataSourceRequest request, ElementType elementType)
{
    if (ModelState.IsValid)
    {
        var currentElementType = db.ElementType.Find(elementType.ElementTypeId);
        db.ElementType.Attach(currentElementType);
        db.ElementType.Remove(currentElementType);
        db.SaveChanges();
    }

    return Json(new[] { elementType }.ToDataSourceResult(request, ModelState));
}

阅读操作按预期工作。我通过TypeName.Current

在Grid视图中获取当前的TypeName

但是，如果我尝试执行任何其他操作，例如销毁或更新，我就会遇到此异常 无法转换类型＆＃39; Iolite.Models.LocalizedString＆＃39;输入＆＃39; System.String＆＃39;。

有任何修复建议吗？

此致

Answer 1

我建议您使用DTO（数据传输对象）来平滑模型，以便更容易地序列化/反序列化对象。您还将减少将在服务器和服务器之间传输的数据量。每个请求中的客户。

对于您的特定实现，您可以定义DTO如下：

public class ElementTypeDTO
{
    public long ElementTypeId { get; set; }
    public string TypeName { get; set; }
}

根据这种架构模式，您必须按照以下步骤更改您的操作：

public ActionResult ElementType_Read([DataSourceRequest]DataSourceRequest request)
{
    List<ElementType> elementTypeList = db.ElementType.ToList();
    IQueryable<ElementType> elementTypes = elementTypeList.AsQueryable();


    DataSourceResult result = elementTypes.ToDataSourceResult(request, elementType => new ElementTypeDTO
    {
        ElementTypeId = elementType.ElementTypeId,
        TypeName = elementType.TypeName.Current,
    });

    return Json(result);
}

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult ElementType_Destroy([DataSourceRequest]DataSourceRequest request, ElementTypeDTO elementType)
{
    if (ModelState.IsValid)
    {
        var currentElementType = db.ElementType.Find(elementType.ElementTypeId);
        db.ElementType.Attach(currentElementType);
        db.ElementType.Remove(currentElementType);
        db.SaveChanges();
    }

    return Json(new[] { elementType }.ToDataSourceResult(request, ModelState));
}

复杂属性Kendo数据源

1 个答案: