如何实施"；申请信用证；如果通过.Net C#代码使用Interop.QBFC13Lib.dll可为该客户提供信用，则将该信用证转换为现有发票？

我在尝试对现有发票实施Quickbooks的“应用信用”功能时遇到了问题，如果该客户可以获得信用。我可以通过Quickbooks桌面UI实现，但无法通过.Net集成应用程序（用C#编写）实现。有谁能给我介绍一下吗

我正在使用的代码通过C#代码对Quickbooks实现“应用信用”。 我得到一个错误：“QuickBooks在解析提供的XML文本流时发现了一个错误。”代码如下

public void ApplyCreditsOnPrePayInvoices()
    {
      // open connection and begin session before data fetch - intentionally skipped this code
      IMsgSetRequest msgset = null;
      ICreditMemoQuery creditMemoQuery = null;
      string sCustomerName = string.Empty;
      if (this.GetConnectedToQB()) //this is the method call to login to quickbooks desktop
      {
        try
        {
          // during data fetch
          msgset = m_sessionManager.CreateMsgSetRequest("US", 8, 0);
          creditMemoQuery = msgset.AppendCreditMemoQueryRq();
          creditMemoQuery.ORTxnQuery.TxnFilter.ORDateRangeFilter.ModifiedDateRangeFilter.FromModifiedDate.SetValue(new DateTime(2012, 3, 31), false);
      IMsgSetResponse msgRes = m_sessionManager.DoRequests(msgset);
      IResponseList responseList = msgRes.ResponseList;
      if (responseList.Count > 0)
      {
        IResponse response = responseList.GetAt(0);
        ICreditMemoRetList creditMemoList = response.Detail as ICreditMemoRetList;
        if (creditMemoList == null)
        {
          return;
        }
        for (int i = 0; i <= creditMemoList.Count - 1; i++)
        {
          ICreditMemoRet qbCreditMemo = creditMemoList.GetAt(i);
          if (this.GetQBCustomerListId(qbCreditMemo.CustomerRef.FullName.GetValue()) != string.Empty)
          {
            m_requestMsgSet.ClearRequests();
            m_requestMsgSet.Attributes.OnError = ENRqOnError.roeContinue;
            IInvoiceAdd invoiceAddRq = m_requestMsgSet.AppendInvoiceAddRq();
            invoiceAddRq.CustomerRef.FullName.SetValue(qbCreditMemo.CustomerRef.FullName.GetValue());
            ISetCredit SetCredit1 = invoiceAddRq.SetCreditList.Append();
            SetCredit1.CreditTxnID.SetValue(qbCreditMemo.TxnID.GetValue());
            SetCredit1.AppliedAmount.SetValue(qbCreditMemo.TotalAmount.GetValue());
            IMsgSetResponse responseSetInvoice = m_sessionManager.DoRequests(m_requestMsgSet);
            DataSet dsInvoice = this.GetExtractResponseFromQB(responseSetInvoice);
            string sQueryResponse = Stringcl.GetValue(dsInvoice.Tables["InvoiceAddRs"].Rows[0]["statusMessage"]);
            if (sQueryResponse == "Status OK")
            {
              Console.WriteLine("Credit no.:" + qbCreditMemo.TxnID.GetValue() + " Customer:" + qbCreditMemo.CustomerRef.FullName.GetValue() + " Total:" + qbCreditMemo.TotalAmount.GetValue());
            }
          }
        }
      }
    }
    catch (Exception ex)
    {
      string ss = ex.Message;
      //handle exception here
    }
    finally
    {
      if (msgset != null)
      {
        Marshal.FinalReleaseComObject(msgset);
      }
      if (creditMemoQuery != null)
      {
        Marshal.FinalReleaseComObject(creditMemoQuery);
      }
    }
  }

  // end session and close connection after data fetch - intentionally skipped this code
}

public void applycreditsonpreadwardinvoices（）
{
//在获取数据之前打开连接并开始会话-故意跳过此代码
IMsgSetRequest msgset=null；
ICreditMemoQuery creditMemoQuery=null；
string sCustomerName=string.Empty；
if（this.GetConnectedToQB（））//这是登录到quickbooks桌面的方法调用
{
尝试
{
//在数据获取期间
msgset=m_sessionManager.CreateMsgSetRequest（“US”，8,0）；
creditMemoQuery=msgset.AppendCreditMemoQueryRq（）；
creditMemoQuery.ORTxnQuery.TxnFilter.ORDateRangeFilter.ModifiedDataRangeFilter.FromModifiedDate.SetValue（新日期时间（2012,3,31），false）；
IMsgSetResponse msgRes=m_sessionManager.DoRequests（msgset）；
IResponseList responseList=msgRes.responseList；
如果（responseList.Count>0）
{
IResponse-response=responseList.GetAt（0）；
ICreditMemoRetList CreditMemorList=响应。详细信息为ICreditMemoRetList；
如果（creditMemoList==null）
{
返回；
}
对于（int i=0；i我使用以下函数得到了解：-

public void ApplyCreditsOnPrePayInvoices(string sMonth, string sYear)
{
  IMsgSetRequest IMsgSetRequestToQB = null;
  ICreditMemoQuery ICreditMemoQueryToQB = null;
  string sInvoiceTxnId = string.Empty;
  string sInvoiceNumber = string.Empty;
  if (this.GetConnectedToQB())
  {
    try
    {
      IMsgSetRequestToQB = m_sessionManager.CreateMsgSetRequest("US", 8, 0);
      ICreditMemoQueryToQB = IMsgSetRequestToQB.AppendCreditMemoQueryRq();
      ICreditMemoQueryToQB.ORTxnQuery.TxnFilter.ORDateRangeFilter.ModifiedDateRangeFilter.FromModifiedDate.SetValue(DateTimecl.GetValue("1." + sMonth + sYear), true);
      IMsgSetResponse IMsgSetResponseFromQB = m_sessionManager.DoRequests(IMsgSetRequestToQB);
      IResponseList ICreditListMemoAvailable = IMsgSetResponseFromQB.ResponseList;
      if (ICreditListMemoAvailable.Count > 0)
      {
        string sCustomerListIdQB = string.Empty;
        string sCustomerAccountNumber = string.Empty;
        string sQBImportPrepayAccounts = Path.Combine(Environment.CurrentDirectory, sMonth + sYear, "Step11_QBImport_PrepayAccounts.csv");
        DataTable dtQBImportPrepayAccounts = Utilcl.GetDataTableFromCSVFile(sQBImportPrepayAccounts);
        IResponse ICreditMemoAvailable = ICreditListMemoAvailable.GetAt(0);
        ICreditMemoRetList iCreditMemoList = ICreditMemoAvailable.Detail as ICreditMemoRetList;
        if (iCreditMemoList != null)
        {
          for (int iCtr = 0; iCtr <= iCreditMemoList.Count - 1; iCtr++)
          {
            ICreditMemoRet ICreditMemo = iCreditMemoList.GetAt(iCtr);
            DataRow[] drInvoiceNos = dtQBImportPrepayAccounts.Select("RefNumber = '" + ICreditMemo.RefNumber.GetValue() + "'");
            if (drInvoiceNos.Length > 0)
            {
              sInvoiceNumber = Stringcl.GetValue(drInvoiceNos[0]["RefNumber"]);
              m_requestMsgSet.ClearRequests();
              m_requestMsgSet.Attributes.OnError = ENRqOnError.roeContinue;
              IReceivePaymentAdd IReceivePayment = m_requestMsgSet.AppendReceivePaymentAddRq();
              sInvoiceTxnId = this.GetQBInvoiceTxnIDList(ICreditMemo.CustomerRef.FullName.GetValue()); //To get the Transaction ID of Invoice
              IReceivePayment.CustomerRef.FullName.SetValue(Stringcl.GetValue(ICreditMemo.CustomerRef.FullName.GetValue()));
              IAppliedToTxnAdd IAppliedToTxnAddress = IReceivePayment.ORApplyPayment.AppliedToTxnAddList.Append();
              IAppliedToTxnAddress.TxnID.SetValue(sInvoiceTxnId);
              ISetCredit ISetCreditToInvoice = IAppliedToTxnAddress.SetCreditList.Append();
              ISetCreditToInvoice.CreditTxnID.SetValue(ICreditMemo.TxnID.GetValue());
              ISetCreditToInvoice.AppliedAmount.SetValue(ICreditMemo.TotalAmount.GetValue());
              IMsgSetResponse responseApplyCredit = m_sessionManager.DoRequests(m_requestMsgSet);
              DataSet dsInvoice = this.GetExtractResponseFromQB(responseApplyCredit);
              string sQueryResponse = Stringcl.GetValue(dsInvoice.Tables["ReceivePaymentAddRs"].Rows[0]["statusMessage"]);
              if (sQueryResponse != "Status OK")
              {
                Utilcl.LogMessage("QB Credit Memo Query Response: " + sQueryResponse);
              }
            }
          }
        }
      }
    }
    catch (Exception ex)
    {
      Utilcl.LogMessage(ex);
    }
    finally
    {
      if (IMsgSetRequestToQB != null)
      {
        Marshal.FinalReleaseComObject(IMsgSetRequestToQB);
      }
      if (ICreditMemoQueryToQB != null)
      {
        Marshal.FinalReleaseComObject(ICreditMemoQueryToQB);
      }
    }
  }
}

public void applycreditsonpreadvanced发票（字符串sMonth，字符串sYear）
{
IMsgSetRequest IMsgSetRequestToQB=null；
ICREDITMOORQUERY ICREDITMOORQUERYTOQB=null；
string sInvoiceTxnId=string.Empty；
string sInvoiceNumber=string.Empty；
if（this.GetConnectedToQB（））
{
尝试
{
IMsgSetRequestToQB=m_sessionManager.CreateMsgSetRequest（“US”，8，0）；
ICreditMemoQueryToQB=IMsgSetRequestToQB.AppendCreditMemoQueryRq（）；
ICreditMemoQueryToQB.ORTxnQuery.TxnFilter.ORDateRangeFilter.ModifiedDataRangeFilter.FromModifiedDate.SetValue（DateTimecl.GetValue（“1.”+sMonth+sYear），true）；
IMsgSetResponse IMsgSetResponseFromQB=m_sessionManager.DoRequests（IMsgSetRequestToQB）；
IResponseList ICreditListMemoAvailable=IMsgSetResponseFromQB.ResponseList；
如果（ICreditListMemoAvailable.Count>0）
{
string sCustomerListIdQB=string.Empty；
string sCustomerAccountNumber=string.Empty；
字符串sqbimportpreadwardaccounts=Path.Combine（Environment.CurrentDirectory，sMonth+sYear，“Step11_QBImport_preadwardaccounts.csv”）；
DataTable DTQBIMPortPreadwardAccounts=Utilcl.GetDataTableFromCSVFile（SQBIMPortPreadwardAccounts）；
IResponse ICreditMemoAvailable=ICreditListMemoAvailable.GetAt（0）；
ICreditMemoRetList ICREditMemorList=ICREditMemorAvailable。详细信息为ICreditMemoRetList；
如果（iCreditMemoList！=null）
{
（国际卢旺达问题国际法庭=0；国际卢旺达问题国际法庭0）
{
sInvoiceNumber=Stringcl.GetValue（drInvoiceNos[0][“RefNumber”]）；
m_requestMsgSet.ClearRequests（）；
m_requestMsgSet.Attributes.OnError=ENRqOnError.roeContinue；
IReceivePaymentAdd IReceivePayment=m_requestMsgSet.AppendReceivePaymentAddRq（）；
sInvoiceTxnId=this.GetQBInvoiceTxnIDList（ICreditMemo.CustomerRef.FullName.GetValue（））；//获取发票的交易ID
IReceivePayment.CustomerRef.FullName.SetValue（Stringcl.GetValue（ICreditMemo.CustomerRef.FullName.GetValue（））；
IAppliedToTxnAdd IAppliedToTxnAddress=IReceivePayment.ORApplyPayment.AppliedToTxnAddList.Append（）；
i应用otxnaddress.TxnID.SetValue（sInvoiceTxnId）；
ISetCredit ISetCreditToInvoice=iaappliedtotxNaddress.SetCreditList.Append（）；
ISetCreditToInvoice.CreditTxnID.SetValue（icredItemo.TxnID.GetValue（））；
ISetCreditToInvoice.AppliedAmount.SetValue（icredItemo.TotalAmount.GetValue（））；
IMsgSetResponse responseaplycredit=m_sessionManager.DoRequests（m_requestMsgSet）；
数据集dsInvoice=this.GetExtractResponseFromQB（responseApplyCredit）；
string sQueryResponse=Stringcl.GetValue（dsInvoice.Tables[“ReceivePaymentAddRs”]。行[0][“statusMessage”]）；
if（sQueryResponse！=“状态正常”）
{
Utilcl.LogMessage（“QB信用备忘录查询响应：“+sQueryResponse”）；
}
}
}
}
}
}
捕获（例外情况除外）
{
使用日志消息（ex）；
}
最后
{
if（IMsgSetRequestToQB！=null）
{
封送。最终电子对象（IMsgSetRequestToQB）；
}
如果（ICreditMemoQueryToQB！=null）
{
最终选举对象（ICREDITMOORQUERYTOQB）；
}
}
}
}
请提供一些您尝试过的代码。您的问题应该是感谢Balagurunathan的回答，我已经在下面发布了用于实现“申请信用”的代码到Quickbooks。你应该编辑你的问题并发布你的代码。请阅读好的问题谢谢你的回答，我在问题部分这样做了，如果可能的话请提供帮助。