Question

我正在尝试将SQL Server数据库表转换为XML文件。我跟着this solution。我创建了这个类，如解决方案

所示

public class XmlResult : ActionResult
{
    private object objectToSerialize;

    /// <summary>
    /// Initializes a new instance of the <see cref="XmlResult"/> class.
    /// </summary>
    /// <param name="objectToSerialize">The object to serialize to XML.</param>
    public XmlResult(object objectToSerialize)
    {
        this.objectToSerialize = objectToSerialize;
    }

    /// <summary>
    /// Gets the object to be serialized to XML.
    /// </summary>
    public object ObjectToSerialize
    {
        get { return this.objectToSerialize; }
    }

    /// <summary>
    /// Serialises the object that was passed into the constructor to XML and writes the corresponding XML to the result stream.
    /// </summary>
    /// <param name="context">The controller context for the current request.</param>
    public override void ExecuteResult(ControllerContext context)
    {
        if (this.objectToSerialize != null)
        {
            context.HttpContext.Response.Clear();
            XmlRootAttribute root = new XmlRootAttribute("response");

            var xs = new System.Xml.Serialization.XmlSerializer(this.objectToSerialize.GetType(), root);
            context.HttpContext.Response.ContentType = "text/xml";

            xs.Serialize(context.HttpContext.Response.Output, this.objectToSerialize);
        }
    }

而不是：

public ActionResult GetStuffAsXml(int id)
{
    var dbStuff = db.GetStuff(id);
    // fetch stuff in database
    return new XmlResult(dbStuff);
}

我写过这个（我的目的是获得所有产品）：

public ActionResult Transfer()
        {
            var product = from s in db.Product
                      select s;
            // fetch stuff in database
            return new XmlResult(product);
        }

在调试过程中，出现了这个错误：

要成为XML可序列化，从IEnumerable继承的类型必须具有 Add（System.Object）在其所有级别的实现继承层次结构。 System.Data.Entity.Infrastructure.DbQuery`1 [Overstock.Models.Product， Overstock，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null]] 没有实现Add（System.Object）。

来源错误：

第42行：var xs = new System.Xml.Serialization.XmlSerializer（this.objectToSerialize.GetType（）根）;

我认为错误即将发生，因为我正在以错误的方式处理产品：

var product = from db.Product中的s选择s;

我应该以什么形式将数据发送到XmlResult类，以便将SQL Server表转换为XML文件格式？

Answer 1

如果'db'是此方法中的DbContext

var product = from s in db.Product
                  select s;
// fetch stuff in database
return new XmlResult(product);

然后你没有得到DataRow或DataTable，你得到了一个强类型类的集合。如果你想要make xml，请使用以下代码：

public static string SerializeAsXml<T>(T element)
{
    XmlSerializer xmlSerializer = new XmlSerializer(element.);
    StringWriter textWriter = new StringWriter();

    xmlSerializer.Serialize(textWriter, element.GetType());
    return textWriter.ToString();
}

称之为

var products = from s in db.Product
                  select s;
// fetch stuff in database
return SerializeAsXml(products);

如何在ASP.NET MVC4中将数据库表转换为XML

1 个答案: