System.Data.ConstraintException: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
at System.Data.DataTable.EnableConstraints()
at System.Data.DataTable.set_EnforceConstraints(Boolean value)
at System.Data.DataTable.EndLoadData()
遇到这个错误 Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
请参考msdn文章来debug找出错误的地方: http://msdn.microsoft.com/en-us/library/system.data.datatable.geterrors(VS.71).aspx
它检查DataSet中的所有DataTable的HasErrors属性,然后对有错误的DataTable使用GetErrors方法。
GetErrors返回一组DataRows,检查返回的所有DataRow的RowError属性来获得确切的错误信息。
DataTable dataTable = new DataTable() int returnValue = 0; try { returnValue = this.Adapter.Fill(dataTable); } catch (System.Data.DataException e) { System.Data.DataRow[] rowsInError; System.Text.StringBuilder sbError = new System.Text.StringBuilder(); // Test if the table has errors. If not, skip it. if (dataTable.HasErrors) { // Get an array of all rows with errors. rowsInError = dataTable.GetErrors(); // Print the error of each column in each row. for (int i = 0; i < rowsInError.Length; i++) { foreach (System.Data.DataColumn column in dataTable.Columns) { sbError.Append(column.ColumnName + " " + rowsInError[i].GetColumnError(column)); } // Clear the row errors rowsInError[i].ClearErrors(); } } string time = System.DateTime.Now.ToString(); var fileName = "Error.log"; string filePath = System.Web.HttpContext.Current.Server.MapPath(fileName); System.IO.FileStream fst = new System.IO.FileStream(filePath, System.IO.FileMode.Append); System.IO.StreamWriter swt = new System.IO.StreamWriter(fst, System.Text.Encoding.GetEncoding("utf-8")); swt.WriteLine("======================"); swt.WriteLine(time); swt.WriteLine("----------------------"); swt.WriteLine(sbError.ToString()); swt.WriteLine("----------------------"); swt.WriteLine(e.ToString()); swt.Close(); fst.Close(); } return returnValue;
具体错误将显示在日志中
======================
2/27/2014 11:47:54 PM
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CustomerID ParentCustomerID CustomerNumber Column 'CustomerNumber' exceeds the MaxLength limit.Name StatementName Inactive OnHold EMailAddress TimeStamp ShippingMethodID PriceLevel TradeDiscount TaxExempt ClassID UserDefine1 UserDefine2 CreditLimitType TimeStamp1 ActivationCode
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System.Data.ConstraintException: Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
at System.Data.DataTable.EnableConstraints()
at System.Data.DataTable.set_EnforceConstraints(Boolean value)
at System.Data.DataTable.EndLoadData()
at System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DataAdapter.Fill(DataTable[] dataTables, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)
at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)
at Nodus.Applications.EPay.Data.EntitiesTableAdapters.CustomerTableAdapter.FillByKeyword(CustomerDataTable dataTable, String Keyword, Nullable`1 MaxResults)