Question

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;

        }

Answer 1

尝试：

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

        foreach (var taxLaw in obj)
        {
                var taxTableHistory = new TaxTableHistory();
                taxTableHistory.CompanyCode = taxLaw.CompanyCode;
                taxTableHistory.CummulativeAmount = taxLaw.CummulativeAmount;
                taxTableHistory.Percentage = taxLaw.Percentage;
                taxTableHistory.ModifiedDate = DateTime.UtcNow;
                taxTableHistory.ModifiedDate = taxLaw.ModifiedDate;
                taxTableHistory.Status = EntityStatus.Active;

            _taxhistoryrepo.DbSetEntity.Add(taxTableHistory);

            await  _taxhistoryrepo.DbContext.SaveChangesAsync();
            await  Task.FromResult(_repository.SingleSave(obj));
         }
        trans.Commit();
    }
    return true;
}

Answer 2

obj的类型

public class DiffPackageSubClass extends Test {
    public static void main(String[] args) {
        Test t1 = new Test();
        System.out.println(t1.a);
        t1.display(); // error
        DiffPackageSubClass diffPackageSubClass = new DiffPackageSubClass();
        diffPackageSubClass.display(); // ok 

    }
}

所以每个团队都是

IEnumerable<TaxLaw>

然后您要保存到

TaxLaw

我相信正在使用

_taxhistoryrepo

这部分代码：

TaxHistory

通过obj进行描述，因此“列表”是TaxLaw，但在这里：

 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));
  }

您将TaxLaw类型添加到TaxHistory表

我也相信这里是您的错字

_taxhistoryrepo.DbContext.SaveChangesAsync()

基本上是用相同的变量设置相同的变量

我想你想要实现的是：

list.CompanyCode = list.CompanyCode;
...

Answer 3

您试图将Model.TaxLaw对象添加到TaxTableHisory存储库中，因为obj是TaxLaw的IEnumerable。

foreach (var list in obj)
_taxhistoryrepo.DbSetEntity.Add(list);

您需要创建一个类型为TaxTableHisory的新对象并添加该对象

public async Task<bool> SaveOrUpdate(IEnumerable<TaxLaw> taxLawList)
    {
        using (var trans = _taxhistoryrepo.DbContext.Database.BeginTransaction())
        {
            foreach (var taxLaw in taxLawList)
            {
                var taxTableHisory = new TaxTableHisory();
                taxTableHisory.CompanyCode = taxLaw.CompanyCode;
                taxTableHisory.CummulativeAmount = taxLaw.CummulativeAmount;
                taxTableHisory.Percentage = taxLaw.Percentage;
                taxTableHisory.ModifiedDate = taxLaw.ModifiedDate;
                taxTableHisory.Status = EntityStatus.Active;

                _taxhistoryrepo.DbSetEntity.Add(taxTableHisory);
                await _taxhistoryrepo.DbContext.SaveChangesAsync();
            }
            trans.Commit();
        }
        return true;
    }

Ps：可能taxTableHisory是taxTableHistory的类型错误

Answer 4

尽管以下代码可以解决您的问题，但是您可以使用AutoMapper将一个对象映射到另一个对象。

public  async Task<bool> SaveOrUpdate(IEnumerable<TaxLaw> obj)
    {
        using (var trans = _taxhistoryrepo.DbContext.Database.BeginTransaction())
        {
            foreach (var list in obj)
            {
                _taxhistoryrepo.DbSetEntity.Add(new TaxTableHistory {
                    CompanyCode = list.CompanyCode,
                    CummulativeAmount = list.CummulativeAmount,
                    Percentage = list.Percentage,
                    ModifiedDate = DateTime.UtcNow,
                    ModifiedDate = list.ModifiedDate,
                    Status = EntityStatus.Active
            });

            await  _taxhistoryrepo.DbContext.SaveChangesAsync();
            await  Task.FromResult(_repository.SingleSave(obj));
         }
         trans.Commit();
        }
        return true;
    }

无法从一种模型转换为另一种模型

4 个答案: