c# - 无法从一种模型转换为另一种模型

我正在尝试保存到两个不同的表中。从Taxlaw中获取数据并保存时，我将相同数据保存在taxlawhistory表中。因此，就像将数据从一个表复制到另一表一样，这是行不通的。我不断收到的错误是


  无法从Model.TaxLaw转换为Model.TaxTableHisory

public  async Task<bool> SaveOrUpdate(IEnumerable<TaxLaw> obj)
        {


            using (var trans = _taxhistoryrepo.DbContext.Database.BeginTransaction())
            {
              var lists = new List<TaxTableHistory>();

                foreach (var list in obj)
                {

                        lists.CompanyCode = list.CompanyCode;
                        lists.CummulativeAmount = list.CummulativeAmount;
                        lists.Percentage = list.Percentage;
                        lists.ModifiedDate = DateTime.UtcNow;
                        lists.ModifiedDate = list.ModifiedDate;
                        lists.Status = EntityStatus.Active;

                        _taxhistoryrepo.DbSetEntity.Add(lists);

                        await  _taxhistoryrepo.DbContext.SaveChangesAsync();
                        await  Task.FromResult(_repository.SingleSave(obj));

                 }
                trans.Commit();
            }
            return true;

        }

最佳答案

obj是类型

IEnumerable<TaxLaw>

所以每个团队

TaxLaw

然后，您尝试保存到

_taxhistoryrepo

我相信正在使用

TaxHistory

这部分代码：

 foreach (var list in obj)
 {
   list.CompanyCode = list.CompanyCode;
   list.CummulativeAmount = list.CummulativeAmount;
   list.Percentage = list.Percentage;
   list.ModifiedDate = DateTime.UtcNow;
   list.ModifiedDate = list.ModifiedDate;
   list.Status = EntityStatus.Active;

   _taxhistoryrepo.DbSetEntity.Add(list);

   await  _taxhistoryrepo.DbContext.SaveChangesAsync();
   await  Task.FromResult(_repository.SingleSave(obj));
  }

通过obj进行迭代，因此“列表”为TaxLaw，但在这里：

_taxhistoryrepo.DbContext.SaveChangesAsync()

您将TaxLaw类型添加到TaxHistory表中

我也相信这里是您的错字

list.CompanyCode = list.CompanyCode;
...

基本上是用相同的变量设置相同的变量

我想您想实现的目标是：

 public  async Task<bool> SaveOrUpdate(IEnumerable<TaxLaw> obj)
    {
        using (var trans = _taxhistoryrepo.DbContext.Database.BeginTransaction())
        {
          var lists = new List<TaxTableHistory>();

            foreach (var list in obj)
            {
                    var taxHistory = new TaxHistory();
                    taxHistory.CompanyCode = list.CompanyCode;
                    taxHistory.CummulativeAmount = list.CummulativeAmount;
                    taxHistory.Percentage = list.Percentage;
                    taxHistory.ModifiedDate = DateTime.UtcNow;
                    taxHistory.ModifiedDate = list.ModifiedDate;
                    taxHistory.Status = EntityStatus.Active;
                    //manually mapped TaxLaw into TaxHistory

                _taxhistoryrepo.DbSetEntity.Add(taxHistory); // save TaxHistory

              await  _taxhistoryrepo.DbContext.SaveChangesAsync();
               await  Task.FromResult(_repository.SingleSave(list)); //here save "list" not obj as you would save whole collection each iteration of the loop

             }
            trans.Commit();
        }
        return true;

    }

关于c# - 无法从一种模型转换为另一种模型，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/53646590/