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Code
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namespace ConsoleApplication1
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{
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using System.Data;
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using System;
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class Program
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{
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static void Main(string[] args)
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{
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TestTableRowState();
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}
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public static void TestTableRowState()
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{
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DataTable table = new DataTable("MasterTable");
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DataColumn column;
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DataRow row;
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column = new DataColumn();
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column.DataType = System.Type.GetType("System.Int32");
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column.ColumnName = "id";
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column.ColumnMapping = MappingType.Hidden;
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column.ReadOnly = true;
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column.Unique = true;
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table.Columns.Add(column);
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column = new DataColumn();
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column.DataType = System.Type.GetType("System.String");
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column.ColumnName = "FirstName";
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column.AutoIncrement = false;
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column.Caption = "第一字段";
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column.ReadOnly = false;
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column.Unique = false;
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table.Columns.Add(column);
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DataColumn[] PrimaryKeyColumns = new DataColumn[1];
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PrimaryKeyColumns[0] = table.Columns["id"];
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table.PrimaryKey = PrimaryKeyColumns;
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DataSet dataset = new DataSet();
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dataset.Tables.Add(table);
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int rowCount = 10;
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for (int i = 0; i < rowCount; i++)
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{
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row = table.NewRow();
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row["id"] = i;
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row["FirstName"] = "liao";
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table.Rows.Add(row);
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Console.WriteLine("The Row_{0}'s RowState is {1}.", i.ToString(), row.RowState.ToString());
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}
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Console.WriteLine("The table RowsCount is {0}.", rowCount);
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//新添加一行
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row = table.NewRow();
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row["id"] = 100;
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row["FirstName"] = "liao";
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table.Rows.Add(row);
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table.AcceptChanges();
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rowCount = table.Rows.Count;
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Console.WriteLine();
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Console.WriteLine("The Row_{0}'s RowState is {1}.", rowCount, row.RowState.ToString());
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Console.WriteLine("The table RowsCount is {0}.", rowCount);
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Console.WriteLine();
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//删除新添加的行
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table.Rows.Remove(row);
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rowCount = table.Rows.Count;
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for (int i = 0; i < rowCount; i++)
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{
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Console.WriteLine("The Row_{0}'s RowState is {1}.", i.ToString(), row.RowState.ToString());
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}
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Console.WriteLine("The table RowsCount is {0}.", rowCount);
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//查询RowState的行
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DataRow[] delRows = table.Select(null, null, DataViewRowState.Deleted);
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Console.WriteLine("Deleted rows:\n");
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foreach (DataColumn catCol in table.Columns)
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Console.Write(catCol.ColumnName + "\t");
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Console.WriteLine();
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foreach (DataRow delRow in delRows)
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{
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foreach (DataColumn catCol in table.Columns)
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Console.Write(delRow[catCol, DataRowVersion.Original] + "\t");
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Console.WriteLine();
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}
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Console.ReadLine();
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}
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}
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}
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运行结果如下:
![](https://images.cnblogs.com/cnblogs_com/mishy/blog20090520.JPG)
问题,为什么第二次输出的RowState 是Detached呢?
不解!希望帮忙解析一下。