CS1929 C＃'RfcParameterClass'不包含'Cast'的定义

问题描述

CS1929 C＃'RfcParameterClass'不包含'Cast'的定义，最佳扩展方法重载'ParallelEnumerable.Cast（ParallelQuery）'需要类型为'ParallelQuery'的接收器

大家好，我正在制作一种适用于SAP RFC连接器的方法。连接工作正常，我能够轻松地从SAP获取数据，但是使用此数据存在问题。 CS1929错误导致代码底部的查询。我想根据这些数据设置很多“ MLFBCode”实例。谁能帮我吗？我正在使用VS 16.7.3和.NET Core 3.1。非常感谢！

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;
using RFCCONNECTORLib;
using SmartLab_System.AppConfig;
using SmartLab_System.Models;
using RfcData = RFCCONNECTORLib.RfcParameterClass;
using RfcRow = RFCCONNECTORLib.RfcFields;

namespace SmartLab_System.Data
{
    public static class RFCMethodsForSLS
    {
        private static NWRfcSession Session = new NWRfcSession();
        //Info: https://rfcconnector.com/documentation/api/session/
        public static bool WasConnected { get; private set; } = true;
        public static Regex RegexPattern { get; private set; } = new Regex(Validation.MLFBLuke);

        /// <summary>
        /// Calls the "Connecting" method which returns wanted MLFB entries from SAP
        /// </summary>
        /// <param name="inputString">String which will be searched</param>
        /// <param name="strLanguage">Set language "CS","EN","DE",...</param>
        /// <param name="maxRows">Set maximum returned rows count</param>
        public static List<MLFBCode> GetMLFBData(string inputString,int maxRows = 100000,string strLanguage = "CS",string onlyIn4711 = "X")
        {
            string functionName = "/SIE/AD_ZPE_TL_MAT_INFO";
            List<KeyValuePair<string,string>> inputParameters = new List<KeyValuePair<string,string>>();
            List<string> outPutParameters = new List<string>();

            inputParameters.Add(new KeyValuePair<string,string>("INPUT_STRING",inputString));
            inputParameters.Add(new KeyValuePair<string,string>("LANG",strLanguage));
            inputParameters.Add(new KeyValuePair<string,string>("ONLY_IN_4711",onlyIn4711));

            outPutParameters.Add("MLFB");               // mlfb
            outPutParameters.Add("MATNR");              // matnr (number)
            outPutParameters.Add("MAKTG");              // text  (description)
            outPutParameters.Add("DEL_STAT");           // vymaz na urovni master dat           - "X" means Deleted
            outPutParameters.Add("DEL_STAT_WERK");      // vymaz na urovni zavodu               - "X" means Deleted
            outPutParameters.Add("DEL_DISPO_99");       // docasny vymaz na urovni disponenta   - "X" means Deleted
            outPutParameters.Add("DEL_STAT_LV");        // docasny vymaz statusem               - "X" means Deleted
            outPutParameters.Add("EXISTS_IN_4711");     // material zalozen pro nas zavod       - "X" means was set for OEZ

            RfcData data = (RfcData)Connecting(functionName,inputParameters);
            List<MLFBCode> mLFBs = new List<MLFBCode>();
            List<RFCOutputData> rFCOutputData = new List<RFCOutputData>();

            mLFBs = (from RfcRow dataRow in data
                           select new MLFBCode()
                           {
                               MLFB = dataRow["MLFB"].ToString(),Number = dataRow["MLFB"].ToString(),Description = dataRow["MAKTG"].ToString(),IdGroup = 1,Active = true
                           }).ToList();
            
            return mLFBs;
        }

编辑问题-确保添加了Connecting（functionName，inputParameters）方法代码：

private static Object Connecting(string functionName,List<KeyValuePair<string,string>> inputParameters)
    {
        Regex regex = new Regex(Validation.MLFB);
        Object data = new { };
        string[,] resultTableArray = new string[,] { };
        SetRFC();   //Set login data
        if (!Session.IsConnected)
        {
            Session.Connect();      //Connection to SAP
            if (Session.IsConnected)
            {
                FunctionCall fn = Session.ImportCall(functionName); //Set call
                foreach (KeyValuePair<string,string> param in inputParameters) //Inserting input parametters of the SAP function
                {
                    fn.Importing[param.Key].value = param.Value;
                }

                Session.CallFunction(fn,true);                                     //Calling the function
                data = fn.Tables["RESULT_TABLE"];                               //Getting data from SAP
                
            }
            else WasConnected = false;
        }
        if (WasConnected)
            Session.Disconnect();
        return data;
    }

解决方法

相信您使用的图书馆是RFCConnector。

但是值得一提的是

 from RFCRow row in data

“ 预编译”为此C＃代码

data.Cast<RFCRow>();

正如您所看到的，在您的Cast类中没有定义称为RfcParameterClass的方法，也没有同名的扩展方法可以接受RFCParameterClass类型第一个参数，因此它不会编译。我想您需要执行以下操作：

from RfcRow row in data.Rows

更新

要获得一行的实际值，您需要对此调用value，因此您的代码将如下所示：

(from RfcRow dataRow in data.Rows
 select new MLFBCode()
 {
     MLFB = dataRow["MLFB"].value.ToString(),Number = dataRow["MLFB"].value.ToString(),Description = dataRow["MAKTG"].value.ToString(),IdGroup = 1,Active = true
  }).ToList();