將數據表轉換為IEnumerable時出錯

Question

我收到以下錯誤

錯誤：無法將類型'System.Data.EnumerableRowCollection'隱式轉換為'System.Collections.Generic.IEnumerable'。 存在顯式轉換（是否缺少強制轉換？）C：\\ Users \\ e19206 \\ Documents \\ Visual Studio 2010 \\ Projects \\ TerroristMVC \\ TerroristBAL \\ Models \\ Landingbal.cs 51 20 TerroristBAL

這是我的代碼

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();
}

這是我的登陸模型課

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

由於dtRepSummary.AsEnumerable()返回IEnumerable<DataRow>但返回類型為IEnumerable<Landing> ，因此出現錯誤，可以使用Select來投影您的類型，如下所示：

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