如何在类中实现接口功能

Question

我正在将vb.net代码转换为c＃。 将类型化的数据集从实体类传递到dataaccess中可用的未类型化的数据集参数时，我在C＃中遇到错误，但在vb.net中却没有得到错误。

一个函数在INTERFACE中声明，而我正在一个类中实现。 通过Google，我找到了如何在INTERFACE中声明一个函数，但是我不知道如何在该类中实现。

从函数中，我既需要计数，也需要数据表，因为我在函数中使用了ref。 如何实现下面提到的功能？

我想实现以下提到的功能。

int ExecuteDataAdapterDataTableWithParams<T>(IDbCommand podbCommand, ref T pdtDataTable) where T : DataTable;

将下面提到的代码从VB.NET代码转换为C＃

接口代码：

Function ExecuteDataAdapterDataTableWithParams(ByVal podbCommand As IDbCommand, _
  ByRef pdtDataTable As DataTable) As Integer

实施代码：

Public Function ExecuteDataAdapterDataTableWithParams(ByVal podbCommand As IDbCommand, _
      ByRef pdtDT As DataTable) _
      As Integer Implements diNonTransactional.ExecuteDataAdapterDataTableWithParams
  Dim ldaDataAdapter As IDataAdapter
  Dim lodbTrans As IDbTransaction
  Dim liFetchedRows As Integer
  lodbTrans = EstablishConnection()
  'EstablishConnection()
  Try
    podbCommand.Connection = coConnection
    podbCommand.Transaction = lodbTrans
    ldaDataAdapter = GetDataAdapter(podbCommand)
    ldaDataAdapter.TableMappings.Add("Table", pdtDT.TableName)
    liFetchedRows = ldaDataAdapter.Fill(pdtDT.DataSet)
  Catch ex As Exception
    Throw ex
  Finally
    CloseConnection(lodbTrans)
    'CloseConnection()
  End Try
  Return liFetchedRows
End Function

将代码从VB.NET转换为C＃，但是下面提到的代码不起作用，因为我将typeddataset从entitty传递给dataaccess。请帮助我如何实现以下代码

提到的功能。

int ExecuteDataAdapterDataTableWithParams(IDbCommand podbCommand, ref DataTable pdtDataTable);

实施代码：

public int ExecuteDataAdapterDataTableWithParams(IDbCommand podbCommand,  ref
        DataTable pdtDT)
{
    IDataAdapter ldaDataAdapter = default(IDataAdapter);
    IDbTransaction lodbTrans = default(IDbTransaction);
    int liFetchedRows = 0;
    lodbTrans = EstablishConnection();
    try
    {
        podbCommand.Connection = coConnection;
        podbCommand.Transaction = lodbTrans;
        ldaDataAdapter = GetDataAdapter(ref podbCommand);
        ldaDataAdapter.TableMappings.Add("Table", pdtDT.TableName);
        liFetchedRows = ldaDataAdapter.Fill(pdtDT.DataSet);
        liFetchedRows = pdtDT.Rows.Count;
    }
    catch (Exception ex)
    {
        throw (ex);
    }
    finally
    {
        CloseConnection(ref lodbTrans);
    }
    return liFetchedRows;
}

如何在dataacess类中实现下面提到的INTERFACE函数？

int ExecuteDataAdapterDataTableWithParams<T>(IDbCommand podbCommand, ref T pdtDataTable) where T : DataTable;

Answer 1

接口

public interface ITest
{
    int ExecuteDataAdapterDataTableWithParams<T>(IDbCommand podbCommand, ref T pdtDataTable) where T : DataTable;
}

履行

public class Test : ITest
{
    public int ExecuteDataAdapterDataTableWithParams<T>(IDbCommand podbCommand, ref T pdtDT) where T : DataTable
    {
        IDataAdapter ldaDataAdapter = default(IDataAdapter);
        IDbTransaction lodbTrans = default(IDbTransaction);
        int liFetchedRows = 0;
        lodbTrans = EstablishConnection();
        try
        {
            podbCommand.Connection = coConnection;
            podbCommand.Transaction = lodbTrans;
            ldaDataAdapter = GetDataAdapter(ref podbCommand);
            ldaDataAdapter.TableMappings.Add("Table", pdtDT.TableName);
            liFetchedRows = ldaDataAdapter.Fill(pdtDT.DataSet);
            liFetchedRows = pdtDT.Rows.Count;
        }
        catch (Exception ex)
        {
            throw (ex);
        }
        finally
        {
            CloseConnection(ref lodbTrans);
        }
        return liFetchedRows;
    }
}