Question

我似乎无法使用foreignKey约束更新模型以获取此错误：

其他信息：参照完整性约束违规发生：a。一端的'Country.Id'的属性值关系与'Setting.CountryId'的属性值不匹配在另一端。

设置模型

namespace Domain
{
    public class Setting : BaseModel
    {

        public string Address { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
        public string Website { get; set; }
        public string Slogan { get; set; }
        public byte[] Logo { get; set; }

        public string City { get; set; }
        public string RegistrationNo { get; set; }

        [ForeignKey("State")]
        public int StateId { get; set; }
        public  State State { get; set; }

        [ForeignKey("Country")]
        public int CountryId { get; set; }
        public  Country Country { get; set; }

        public string IsDefault { get; set; }


    }
}

州模式

namespace Domain
{
    public class State :BaseModel
    {
        public string Name { get; set; }
    }
}

国家/地区模型

namespace Domain
{
    public class Country : BaseModel
    {
        public string Name { get; set; }
    }
}

获取和更新设置的存储库

public Setting GetSetting()
{
    try
    {
        return _db.Settings.Include("Country").Include("State").First();
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
        throw;
    }
}

public Setting UpdateSetting(Setting setting)
{
    try
    {
        _db.Settings.Attach(setting);
        _db.Entry(setting).State = EntityState.Modified;
        _db.SaveChanges();

        return setting;
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
        throw;
    }

}

注意我正在使用WCF代理

按钮单击事件

private void btnSave_Click(object sender, EventArgs e)
{
    //MessageBox.Show(Convert.ToInt16(cmbState.EditValue).ToString());
    //return;

    if (dxValidationProvider1.Validate())
    {
        if (picLogo.Image == null)
        {
            XtraMessageBox.Show("Upload Logo");
        }
        else
        {
            var setting = proxy.GetSetting();
            //MessageBox.Show(cmbState.EditValue.ToString()); return;

            setting.HotelName = txtHotelName.Text;
            setting.Address = txtAddress.Text;
            setting.Email = txtEmail.Text;
            setting.Phone = txtPhone.Text;
            setting.Website = txtWebsite.Text;
            setting.Slogan = txtSlogan.Text;
            setting.City = txtCity.Text;

            setting.CountryId = Convert.ToInt16(cmbCounty.EditValue);

            setting.StateId = Convert.ToInt16(cmbState.EditValue));

            setting.Logo = picLogo.Image.ToByteArray();

            var s = proxy.UpdateSetting(setting);

            MessageBox.Show(@"Updated");
        }
    }
    else
    {
        MessageBox.Show("Please fill the required fields");
    }
}

Answer 1

我刚从GetSetting函数中删除了Include语句，并更新了所有内容。这解决了我的问题

public Setting GetSetting()
{
    try
    {
        return _db.Settings.First();
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
        throw;
    }
}

发生了参照完整性约束违规。更新EF时

1 个答案: