Question

将更改保存到临时变量是成功的，因为在调试时我可以看到值发生变化，但是当我实际尝试将更改保存到数据库时，不会更改所需的字段。

我正试图改变“被调查者”字段的价值。到＆＃39;关闭＆＃39;

nemesysEntities db2 = new nemesysEntities();
report report = db2.reports.Find(investigation.report_id);
report_status rep = db2.report_status.Find(3);
report.report_status = rep;
report.report_status.description = "Closed";
report.report_status.id = 3;
db2.Entry(report).State= EntityState.Modified;
db2.SaveChanges();

存储报告的表称为报告，investig.report_id表示正在调查的报告的ID。因此，通过将报告ID作为值传递，该表应在报告表中找到报告，并通过以下代码行将操作状态的值更改为已关闭（操作的ID＆＃34;已关闭＆＃ 34;在数据库中是3）

report_status rep = db2.report_status.Find(3);

但是，未存储数据库中所需的更改。任何想法??

这是报告的模型

namespace WebApplication2.Models
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.ComponentModel.DataAnnotations;
    using System.Data.Entity;
    using System.Data.Entity.Validation;
    using System.Diagnostics;
    using System.Web;

public partial class report
{

    public report()
    {

        this.investigations = new HashSet<investigation>();
        HttpCookie _userId = System.Web.HttpContext.Current.Request.Cookies["User"];
        string userId="";
        nemesysEntities db = new nemesysEntities();
        if(_userId!=null)
        {
            this.user_id = Convert.ToInt32(_userId["Id"]);
            user temp=db.users.Find(user_id);
            this.email = temp.email;
            this.phone = temp.phone;
            temp.ConfirmPassword = temp.password;
            int i = temp.points;
            i++;
            temp.points = i;
            db.Entry(temp).State = EntityState.Modified;
            try
            {
                db.SaveChanges();
            }
            catch (DbEntityValidationException dbEx)
            {
                foreach (var validationErrors in dbEx.EntityValidationErrors)
                {
                    foreach (var validationError in validationErrors.ValidationErrors)
                    {
                        Trace.TraceInformation("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
                    }
                }
            }
        }
        else
        {
            this.user_id = 13;
        }
        this.status_id = 1;
    }

    public int id { get; set; }
    [Display(Name = "Date of near miss")]
    public System.DateTime date { get; set; }
    [Display(Name = "Location")]
    public string location { get; set; }
    [DisplayName("Type")]
    public int type_id { get; set; }
    [Display(Name = "Description")]
    public string description { get; set; }
    public int status_id { get; set; }
    public int user_id { get; set; }
    [Display(Name = "Email Address")]
    public string email { get; set; }
    [Display(Name = "Phone Number")]
    public string phone { get; set; }
    public int votes { get; set; }

    public virtual ICollection<investigation> investigations { get; set; }
    public virtual report_status report_status { get; set; }
    public virtual report_type report_type { get; set; }
    public virtual user user { get; set; }
}
}

这是调查员的模型。您可以在其中一个setter中看到我使用的方法与我尝试用来更改报告状态的方法相同。

namespace WebApplication2.Models
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    using System.Data.Entity;
    using System.Data.Entity.Validation;
    using System.Diagnostics;
    using System.Web;

public partial class investigation
{

    public investigation()
    {
        HttpCookie _userId = System.Web.HttpContext.Current.Request.Cookies["User"];
        if (_userId != null)
        {
            this.investigator_id = Convert.ToInt32(_userId["Id"]);
            //5 is the primary key of "Being investigated" in type of action
            this.action_id = 5;
            this.cause = "";
            this.date_of_action = new DateTime(2012, 1, 3);

        }
    }
    public int id { get; set; }
    [Display (Name="Formal Description")]
    public string formal_description { get; set; }
    [Display(Name = "Cause of Hazard")]
    public string cause { get; set; }
    [Display(Name = "Action Take")]
    public int action_id { get; set; }
     [Display(Name = "Date of Action")]
    public System.DateTime date_of_action { get; set; }
    public int investigator_id { get; set; }
    int _report_id;
    [Display(Name = "Report Id:")]
    public int report_id
    {
        get
        {
            return _report_id;
        }
        set
        {

            _report_id = value;
            nemesysEntities db = new nemesysEntities();
            report report = db.reports.Find(this.report_id);
            //2 is the primary key of "Being investigated" in report status
            report_status rep = db.report_status.Find(2);
            report.report_status = rep;
            db.Entry(report).State = EntityState.Modified;
            try
            {
                db.SaveChanges();
            }
            catch (DbEntityValidationException dbEx)
            {
                foreach (var validationErrors in dbEx.EntityValidationErrors)
                {
                    foreach (var validationError in validationErrors.ValidationErrors)
                    {
                        Trace.TraceInformation("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
                    }
                }
            }
        }
    }

    public virtual investigation_action investigation_action { get; set; }
    public virtual report report { get; set; }
    public virtual user user { get; set; }
}

}

试图在asp.net中更新表

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