Question

我正在尝试根据主键ID字段从我的数据库中删除一行。当我尝试这样做时，所有代码都会执行而没有任何错误，但该项目不会从数据库中删除。

我将这个项目传递给我的C＃后端从这样的角度前端调用：

delete(customerId: number, materialCustomerId: number): Observable<Response> {
    return this.http.delete(`${this.getBaseUrl()}/${customerId}/materialcustomer/${materialCustomerId}`).catch(error => this.handleError(error));
}

然后点击我的控制器方法：

    [HttpDelete]
    [Route("{customerId}/materialcustomer/{materialCustomerId}")]
    [AccessControl(Securable.Customer, Permissions.Delete, Permissions.Execute)]
    public async Task Delete(int customerId, int materialCustomerId)
    {
        await _materialCustomerDeleter.DeleteAsync(MaterialCustomer.CreateWithOnlyId(materialCustomerId), HttpContext.RequestAborted);
    }

机械手方法：

public async Task DeleteAsync(MaterialCustomer model, CancellationToken cancellationToken = default(CancellationToken))
    {
        if (model == null)
            throw new ArgumentNullException(nameof(model));

        await _materialCustomerDeleter.DeleteAsync(new TblMaterialCustomer { MaterialCustomerId = model.MaterialCustomerId }, cancellationToken);

        if (cancellationToken.IsCancellationRequested)
            return;

        await _customerWriter.CommitAsync(cancellationToken);
    }

最后，我的存储库方法：

public async Task DeleteAsync(TblMaterialCustomer entity, CancellationToken cancellationToken = new CancellationToken())
    {
        var item =
            await _context.TblMaterialCustomer.FirstOrDefaultAsync(i => i.MaterialCustomerId == entity.MaterialCustomerId, cancellationToken);

        if (item == null || cancellationToken.IsCancellationRequested)
            return;

        _context.SetModified(item);

    }

我错过了什么？

Answer 1

假设await _customerWriter.CommitAsync(cancellationToken);调用同一个DbContext实例并调用方法SaveAsync，你应该重写这样的删除方法：

public void Delete(TblMaterialCustomer entity)
{
    _context.TblMaterialCustomer.Remove(entity);
}

同样，从WebAPI调用返回结果可能是个好主意，尽管不需要，例如OK / 200.

public async Task<IHttpActionResult> Delete(int customerId, int materialCustomerId)
{
    await _materialCustomerDeleter.DeleteAsync(MaterialCustomer.CreateWithOnlyId(materialCustomerId), HttpContext.RequestAborted);
    return Ok();
}

使用HttpDelete使用C＃从数据库中删除项目

1 个答案: