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我試圖創建一個webapi,從azure上從sqlserver檢索數據,我得到了這個錯誤。 我在asp.net的WebAPI新的,這是我的第一頁時,我是觀看教程,我做他在做什麼,但我得到這個錯誤從ADO.net檢索並創建webApi
堆棧跟蹤:
at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeAndVerifyType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, Boolean verifyKnownType, RuntimeTypeHandle declaredTypeHandle, Type declaredType)
at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiTypeAtTopLevel(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle originalDeclaredTypeHandle, Type graphType)
at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph, DataContractResolver dataContractResolver)
at System.Runtime.Serialization.DataContractSerializer.WriteObject(XmlWriter writer, Object graph)
at System.Net.Http.Formatting.XmlMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content)
at System.Net.Http.Formatting.XmlMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken) --- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()
我控制器
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using DataBaseAccess;
namespace JoSaleWebApi.Controllers
{
public class BrandController : ApiController
{
public IEnumerable<brand_Table> Get()
{
using (JoSaleDbEntities enitites = new JoSaleDbEntities())
{
return enitites.brand_Table.ToList();
}
}
public brand_Table Get(int id)
{
using (JoSaleDbEntities enitites = new JoSaleDbEntities())
{
return enitites.brand_Table.FirstOrDefault(b => b.brand_id == id);
}
}
}}
ADO生成的類
namespace DataBaseAccess
{
using System;
using System.Collections.Generic;
public partial class brand_Table
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public brand_Table()
{
this.branch_Table = new HashSet<branch_Table>();
this.sale_Table = new HashSet<sale_Table>();
}
public int brand_id { get; set; }
public string brand_name { get; set; }
public string brand_imageUrl { get; set; }
public int company_id { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<branch_Table> branch_Table { get; set; }
public virtual company_Table company_Table { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<sale_Table> sale_Table { get; set; }
}
}
什麼問題?你沒有發佈任何代碼。請澄清。 – Goose
@Goose我添加了控制器代碼和實體類的圖片 –
您需要將您的代碼粘貼到問題中,而不是圖像中。 – Goose