Table是怎样炼成的：Row、RowCollection

接下来的连续几篇，我们要演练作一个描述通用的二维表，并演示该二维表的继承通途。

先定义数据行的状态

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/**//// <summary>

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/// 数据行的状态

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/// </summary>

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public enum RowState

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{

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/**//// <summary>

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/// 新建状态

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/// </summary>

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Added,

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/**//// <summary>

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/// 删除状态

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/// </summary>

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Deleted,

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/**//// <summary>

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/// 修改状态

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/// </summary>

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Modified,

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/**//// <summary>

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/// 为止状态

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/// </summary>

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Unchanged

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}

开始定义数据行了

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/**//// <summary>

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/// 数据行

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/// </summary>

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public class Row

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{

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private object[] datas;

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private System.Collections.ArrayList colNames;

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/**//// <summary>

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/// 该数据行所依赖的表的名称

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/// </summary>

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public readonly string TableName;

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/**//// <summary>

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/// 该数据行的状态

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/// </summary>

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public RowState RowState;

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protected internal Row(ColumnCollection columns, string tableName)

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{

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datas = new object[columns.Count];

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this.TableName = tableName;

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colNames = new System.Collections.ArrayList();

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foreach (Column col in columns)

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{

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colNames.Add(col.ColumnName);

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}

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}

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/**//// <summary>

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/// 获取或设置行的指定列的数据

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/// </summary>

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/// <param name="index">列的索引号，从0开始</param>

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/// <returns>列中存储的数据</returns>

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public object this[int index]

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{

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set

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{

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datas[index] = value;

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this.RowState = RowState.Modified;

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}

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get

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{

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return datas[index];

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}

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}

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/**//// <summary>

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/// 获取或设置行的指定列的数据

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/// </summary>

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/// <param name="columnName">列的名称</param>

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/// <returns>列中存储的数据</returns>

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public object this[string columnName]

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{

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set

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{

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this[colNames.IndexOf(columnName)] = value;

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}

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get

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{

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return this[colNames.IndexOf(columnName)];

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}

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}

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/**//// <summary>

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/// 获取或设置行的全部数据

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/// </summary>

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public object[] ItemArray

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{

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get

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{

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return datas;

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}

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set

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{

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if (value.Length == datas.Length)

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{

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datas = value;

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this.RowState = RowState.Modified;

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}

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}

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}

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/**//// <summary>

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/// 将该行数据状态改为RowState.Unchanged

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/// </summary>

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public void AcceptChanges()

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{

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this.RowState = RowState.Unchanged;

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}

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/**//// <summary>

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/// 为该行作删除标记

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/// </summary>

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public void Delete()

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{

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this.RowState = RowState.Deleted;

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}

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/**//// <summary>

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/// 将该行的状态设置为RowState.Added

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/// </summary>

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public void SetAdded()

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{

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if (this.RowState == RowState.Unchanged)

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{

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this.RowState = RowState.Added;

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}

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}

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/**//// <summary>

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/// 将该行数据状态设置为RowState.Modified

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/// </summary>

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public void SetModified()

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{

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if (this.RowState == RowState.Unchanged || this.RowState == RowState.Added)

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{

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this.RowState = RowState.Modified;

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}

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}

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}

下一篇，我们定义Column和ColumnCollection