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DataSet.MergeFailed Event
.NET Framework (current version)
Occurs when a target and source DataRow have the same primary key value, and EnforceConstraints is set to true.
Assembly: System.Data (in System.Data.dll)
For more information about handling events, see NIB: Consuming Events.
The following example demonstrates the use of the MergeFailed event.
private static void DemonstrateMergeFailedEvent() { // Create a DataSet with one table containing two columns. DataSet dataSet = new DataSet("dataSet"); DataTable table = new DataTable("Items"); // Add table to the DataSet. dataSet.Tables.Add(table); // Add two columns to the DataTable. table.Columns.Add("id", typeof(int)); table.Columns.Add("item", typeof(int)); // Set the primary key to the first column. table.PrimaryKey = new DataColumn[] { table.Columns["id"] }; // Add MergeFailed event handler for the table. dataSet.MergeFailed += new MergeFailedEventHandler(Merge_Failed); // Create a second DataTable identical to the first, DataTable t2 = table.Clone(); // Set the primary key of the new table to the second column. // This will cause the MergeFailed event to be raised when the // table is merged into the DataSet. t2.PrimaryKey = new DataColumn[] { t2.Columns["item"] }; // Merge the table into the DataSet. Console.WriteLine("Merging..."); dataSet.Merge(t2, false, MissingSchemaAction.Add); } private static void Merge_Failed(object sender, MergeFailedEventArgs e) { Console.WriteLine("Merge_Failed Event: '{0}'", e.Conflict); }
.NET Framework
Available since 1.1
Available since 1.1
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