DbContext.SaveChanges(); 不给出错误但不向数据库添加实体

Question

我正在尝试使用以下代码将实体保存到我的数据库:

    public void Add(object entity)
        {
            DbContext.Entry(entity).State = System.Data.EntityState.Added;
            DbContext.SaveChanges();
        } 

我测试过,如果出现问题(例如,实体的字段为空,在数据库中不能为空),则会出错.我填写了所有necesarry字段并调用了此代码.它没有给出错误.但是,该实体也未添加到数据库中.我怎样才能找到DbContext.SaveChanges(); 没有错误信息会出错？

下面是调用Add()函数的代码.

  public void StoreElectronicSignatureType(ElectronicSignatureTypeModel model)
    {
        var RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
        var parameters = RSA.ExportParameters(false);
        model.modulus = Convert.ToBase64String(parameters.Modulus);
        model.exponent = Convert.ToBase64String(parameters.Exponent);
        model.privatekey = RSA.ToXmlString(true);

        ElectronicSignatureType electronicSignatureType = new ElectronicSignatureType();
        Entity entity =  GetEntity(model.entity);
        electronicSignatureType.Entity = entity;
        electronicSignatureType.HashAlgorithm = model.hashAlgorithm;
        electronicSignatureType.Exponent = model.exponent;
        electronicSignatureType.Modulus = model.modulus;
        electronicSignatureType.Version = model.version;
        //electronicSignatureType.EntityId = entity.EntityId;
        electronicSignatureType.PrivateKey = StrToByteArray(model.privatekey);
        Add(electronicSignatureType);
    }

Answer 1

您必须将新实体附加到上下文.尝试:

context.ElectronicSignatureTypes.Add(electronicSignatureType);
context.SaveChanges();