winfrom报表FastReport第二次加载报错跟踪不到

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哪位大神帮忙看看

/// <summary>
         /// 资产领用报表
         /// </summary>
         /// <param name="applyId">领用单Id</param>
         public void ViewReport(string applyId)
         {            
             try
             {
                 report = null;
                 datatable = null;
                 dataviewAsset = null;
 
                 // Create report object
                 report = new TfrxReportClass();
                 report.SetGlobalVariable("Language", "Chinese");
 
                 #region 查询领用单报表数据
                 ApplyBLL applyBll = new ApplyBLL();
                 DataSet ds = null;
                 DataTable dtB2 = null;
                 DataTable dtR2 = null;
                 DataTable dtAsset = null;
 
                 if (!string.IsNullOrEmpty(applyId))
                 {
                     ds = applyBll.GetApplyReport(applyId);
                     dtB2 = ds.Tables["apply"];
                     dtR2 = ds.Tables["applyRel"];
                     dtAsset = ds.Tables["asset"];
                 }
                 #endregion
                 datatable = new FrxDataTable(dtB2);
                 datatable.Dispose();
                 datatable.AcceptChanges();
                 // These events used for Master/Detail implementation
                 datatable.FrxEventOnFirst += new FrxOnFirst(datatable_FrxEventHandler);
                 datatable.FrxEventOnNext += new FrxOnNext(datatable_FrxEventHandler);
                 datatable.FrxEventOnPrior += new FrxOnPrior(datatable_FrxEventHandler);
     
                 // Create the FR compatible DataView object
                 dataviewAsset = new FrxDataView(dtAsset, "DataViewAsset");
 
                 // We need following to make ongoing the report windows modal
                 report.MainWindowHandle = (int)this.Handle;
 
                 // Load demmonstration report from file
                 string reportPath = Smt.Utils.Common.SysRootPath() + "report\\资产领用报表.fr3";
                 report.LoadReportFromFile(reportPath);
 
                 report.ClearDatasets();
                 // Asiign datasets to report one more time
                 // beacuse theLoadReport... family functions breaks links between report and dataset
                 datatable.AssignToReport(true, report);
                 dataviewAsset.AssignToReport(true, report);
                 // Assigns DataTable to MasterBand
                 datatable.AssignToDataBand("MasterData1", report);
                 // Assigns DataView to DetailBand
                 dataviewAsset.AssignToDataBand("DetailData1", report);
                 report.ShowReport();//fastreport自带的预览窗体界面 
             }
             catch (Exception ex)
             {
                  MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
             }
         }

FrxDataTable.cs在楼下。报的错是

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using System; using System.Data; using System.ComponentModel; using FastReport; namespace Smt.EamCS.WinForm { public delegate void FrxOnFirst(); public delegate void FrxOnNext(); public delegate void FrxOnPrior(); /// <summary> /// Summary description for FrxDataSet. /// </summary> public class FrxDataTable : DataTable { private int nItem; TfrxUserDataSetClass m_ds; private DataTable m_ChildTable; public int _nItem { get { return nItem; } set { nItem = value; } } public new string TableName { get { return m_ds.Name; } } public IfrxDataSet FrxTable { get { return m_ds as IfrxDataSet; } } public event FrxOnFirst FrxEventOnFirst; public event FrxOnNext FrxEventOnNext; public event FrxOnPrior FrxEventOnPrior; private void constructor(string name) { try { m_ChildTable = null; m_ds = new TfrxUserDataSetClass(); m_ds.Name = name; m_ds.OnCheckEOF += new IfrxUserDataSetEventDispatcher_OnCheckEOFEventHandler(OnCheckEOFEventHandler); m_ds.OnGetValue += new IfrxUserDataSetEventDispatcher_OnGetValueEventHandler(OnGetValueHandler); m_ds.OnFirst += new IfrxUserDataSetEventDispatcher_OnFirstEventHandler(OnFirstEventHandler); m_ds.OnNext += new IfrxUserDataSetEventDispatcher_OnNextEventHandler(OnNextEventHandler); m_ds.OnPrior += new IfrxUserDataSetEventDispatcher_OnPriorEventHandler(OnPriorEventHandler); DataColumnCollection cols = Columns; cols.CollectionChanged += new CollectionChangeEventHandler(ColumnsCollection_Changed); } catch (Exception ex) { throw ex; } } public FrxDataTable(string name) { constructor(name); } public FrxDataTable(DataTable t) { try { constructor(t.TableName); string FieldNames = null; foreach (DataColumn col in t.Columns) FieldNames += col.Caption + "\n"; m_ds.Fields = FieldNames; m_ChildTable = t; } catch (Exception ex) { throw ex; } } /// <summary> /// Assigns table to report /// </summary> public void AssignToDataBand(string BandName, TfrxReportClass report) { try { IfrxComponent frx_component; frx_component = ((IfrxComponent)report).FindObject(BandName); ((IfrxDataBand)frx_component).DataSet = (IfrxDataSet)m_ds; } catch (Exception ex) { throw ex; } } /// <summary> /// Assigns table to report /// </summary> public void AssignToReport(bool Enable, TfrxReportClass report) { try { report.SelectDataset(Enable, m_ds as IfrxDataSet); } catch (Exception ex) { throw ex; } } /// <summary> /// On First event handler /// </summary> private void OnFirstEventHandler() { try { bool eof; nItem = 0; OnCheckEOFEventHandler(out eof); if (!eof && FrxEventOnFirst != null) FrxEventOnFirst(); } catch (Exception ex) { throw ex; } } /// <summary> /// On Next event handler /// </summary> private void OnNextEventHandler() { try { bool eof; nItem++; OnCheckEOFEventHandler(out eof); if (!eof && FrxEventOnNext != null) FrxEventOnNext(); } catch (Exception ex) { throw ex; } } /// <summary> /// On Prior evene handler /// </summary> private void OnPriorEventHandler() { try { bool eof; nItem--; OnCheckEOFEventHandler(out eof); if (!eof && FrxEventOnPrior != null) FrxEventOnPrior(); } catch (Exception ex) { throw ex; } } /// <summary> /// On check EndOfFile event handler /// </summary> private void OnCheckEOFEventHandler(out bool eof) { try { if (m_ChildTable == null) { eof = (nItem >= Rows.Count); } else { eof = (nItem >= m_ChildTable.Rows.Count); } } catch (Exception ex) { throw ex; } } /// <summary> /// On get value handler /// </summary> public void OnGetValueHandler(object VarName, out object Val) { try { if (m_ChildTable == null) { Val = Rows[nItem][VarName.ToString()]; } else { Val = m_ChildTable.Rows[nItem][VarName.ToString()]; } // FastReport does not know about System.Decimal object type // so convert it to Integer if (Val is Decimal) { Val = Decimal.ToInt32((Decimal)Val); } } catch (Exception ex) { throw ex; } } /// <summary> /// Updates FastReport UserDataSet on Column addition /// </summary> private void ColumnsCollection_Changed(object sender, CollectionChangeEventArgs e) { try { DataColumnCollection cols = (DataColumnCollection)sender; string FieldNames = null; foreach (DataColumn col in cols) FieldNames += col.Caption + "\n"; m_ds.Fields = FieldNames; } catch (Exception ex) { throw ex; } } private void InitializeComponent() { ((System.ComponentModel.ISupportInitialize)(this)).BeginInit(); // // FrxDataTable // ((System.ComponentModel.ISupportInitialize)(this)).EndInit(); } } } 代码是粘的，也不知道从哪跟踪，再打开nItem 就成1了，然后就错了，

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顶啊~！大神归为

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应该是事件注册了没释放的意思，可是不知道在哪释放啊