将数据表转换为 IEnumerable 时出错

Question

我收到以下错误

错误：- 无法隐式转换类型 'System.Data.EnumerableRowCollection' 到 'System.Collections.Generic.IEnumerable'。 存在显式转换（您是否缺少 演员？） C:\Users\e19206\Documents\Visual Studio 2010\Projects\TerroristMVC\TerroristBAL\Models\Landingbal.cs 51 20 TerroristBAL

这是我的代码

public IEnumerable<Landing> getReportSummary()
{
    DataTable dtRepSummary = new DataTable();

    try
    {
        procname = "TDS_QUERY.GET_REP_SUMMARY";

        OracleParameter[] oraParam = new OracleParameter[1];

        oraParam[0] = new OracleParameter("TDS_RECORDSET", OracleDbType.RefCursor);
        oraParam[0].Direction = ParameterDirection.Output;

        connection = new OracleConnection(SqlHelper.GetConnection());

        DataSet ds = SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, procname, oraParam);

        dtRepSummary = ds.Tables[0];
    }
    catch (Exception ex)
    {
        string errormessage = "Method name:- " + MethodBase.GetCurrentMethod().Name + " | Description: " + ex.Message + " " + ex.InnerException;
        log.Error(errormessage);
    }

    return dtRepSummary.AsEnumerable();
}

这是我登陆的Model类

public class Landing
{
    #region properties

    public string Reportid { get; set; }

    public string Reportdate { get; set; }

    public string Fromdate { get; set; }

    public string Todate { get; set; }

    public string Executed { get; set; }

    public string Userid { get; set; }

    public string Recadddate { get; set; }

    #endregion
} 

Answer 1

您收到该错误是因为dtRepSummary.AsEnumerable() 返回IEnumerable<DataRow>，但您的返回类型为IEnumerable<Landing>，您可以使用Select 像这样投影您的类型：-

return dtRepSummary.AsEnumerable().Select(x => new Landing
                                        {
                                           Reportid = x.Field<int>("Reportid"), 
                                           Reportdate = x.Field<string>("Reportdate"),
                                           ..and so on
                                        };