Question

我开始用c＃开发API，以便通过Azure访问在线SQL服务器上的数据。当我在localhost中运行Web API时，一切正常，但是当我发布它时，我的api /雇员却无法在localhost中正常工作。我得到的错误是“ 500（内部服务器错误）” 请帮我，我在互联网上搜索过，但是找不到可以帮助我的东西。

有我的connectionString：

    <add name="groupea07Entities1" connectionString="metadata=res://*/Models.Employee.csdl|res://*/Models.Employee.ssdl|res://*/Models.Employee.msl;provider=System.Data.SqlClient;provider connection string=&quot;Server=tcp:groupea07.database.windows.net,1433;Initial Catalog=groupea07;Persist Security Info=False;User ID=MyUser;Password=MyPwd;MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;&quot;" providerName="System.Data.EntityClient" />

有我的EmployeesController：

public class EmployeesController : ApiController
{
    private groupea07Entities1 db = new groupea07Entities1();

    // GET: api/Employees  
    public IQueryable<Employee> GetEmployees()
    {
        return db.Employee;
    }



    // PUT: api/Employees/5  

    public HttpResponseMessage PutEmployee(Employee employee)
    {
        if (!ModelState.IsValid)
        {
            return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
        }


        db.Entry(employee).State = EntityState.Modified;

        try
        {
            db.SaveChanges();
        }
        catch (DbUpdateConcurrencyException ex)
        {
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
        }

        return Request.CreateResponse(HttpStatusCode.OK);
    }

    // POST: api/Employees  

    public HttpResponseMessage PostEmployee(Employee employee)
    {
        if (!ModelState.IsValid)
        {
            db.Employee.Add(employee);
            db.SaveChanges();
            HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, employee);
            response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = employee.EmployeeID }));
            return response;
        }
        else
        {
            return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
        }

    }

    // DELETE: api/Employees/5  

    public HttpResponseMessage DeleteEmployee(Employee employee)
    {
        Employee remove_employee = db.Employee.Find(employee.EmployeeID);
        if (remove_employee == null)
        {
            return Request.CreateResponse(HttpStatusCode.NotFound);
        }

        db.Employee.Remove(remove_employee);
        try
        {
            db.SaveChanges();
        }
        catch (DbUpdateConcurrencyException ex)
        {
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
        }

        return Request.CreateResponse(HttpStatusCode.OK);
    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            db.Dispose();
        }
        base.Dispose(disposing);
    }

    private bool EmployeeExists(int id)
    {
        return db.Employee.Count(e => e.EmployeeID == id) > 0;
    }
}

Answer 1

错误500是通用错误代码，只要您的webSite / webApi中发生异常，您都将得到它，因此它不会提供有关错误的详细信息。
但是，您的屏幕快照显示该异常是System.InvalidOperationException，更重要的是，引起该异常的innerException是EntityFramework尝试打开数据库The underlying provider failed on Open上的连接的失败尝试。这可能有多种原因。

您的连接字符串可能无效（您是否在其他地方进行过测试？）
用户必须有权读取或写入数据库

大多数时候，在Internet上搜索有关异常的描述（此处为The underlying provider failed on Open）很有帮助。

还有其他可能导致此特殊异常的原因： https://stackoverflow.com/a/3081776/3608483

Web Api C＃的内部服务器错误500

1 个答案: