Table是怎样炼成的：Column、ColumnCollection

描述数据列的类定义

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/**//// <summary>

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/// 描述数据列

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/// </summary>

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public class Column

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{

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public Column(string name, Type type)

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: this(name, type, null)

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{

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}

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public Column(string name, Type type,object defaultValue)

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{

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ColumnName = name;

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DataType = type;

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DefaultValue = defaultValue;

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}

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/**//// <summary>

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/// 获取或设置列的名称

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/// </summary>

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public readonly string ColumnName;

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/**//// <summary>

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/// 获取或设置列的数据类型

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/// </summary>

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public readonly System.Type DataType;

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/**//// <summary>

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/// 获取或设置列的默认值

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/// </summary>

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public object DefaultValue = null;

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}

定义ColumnCollection
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/**//// <summary>

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/// 描述或设置列的集合

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/// </summary>

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public class ColumnCollection : System.Collections.CollectionBase

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{

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/**//// <summary>

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/// 设置或获取指定的列

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/// </summary>

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/// <param name="index"></param>

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/// <returns></returns>

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public Column this[int index]

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{

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get

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{

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return (Column)this.InnerList[index];

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}

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set

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{

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this.InnerList[index] = value;

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}

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}

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/**//// <summary>

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/// 设置或获取指定的列

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/// </summary>

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/// <param name="index"></param>

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/// <returns></returns>

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public Column this[string columnName]

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{

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get

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{

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return (Column)this[this.IndexOf(columnName)];

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}

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set

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{

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

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}

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}

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private System.Collections.ArrayList colNames=new System.Collections.ArrayList();

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/**//// <summary>

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/// 添加一个列

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/// </summary>

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/// <param name="column">列的实例</param>

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public void Add(Column column)

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{

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if(!colNames.Contains(column.ColumnName))

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{

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this.InnerList.Add(column);

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colNames.Add(column.ColumnName);

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}

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}

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/**//// <summary>

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/// 添加一个列

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/// </summary>

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/// <param name="name">列的名称</param>

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/// <param name="type">列的类型</param>

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public void Add(string name, Type type, object defaultValue)

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{

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this.Add(new Column(name, type,defaultValue));

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}

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/**//// <summary>

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/// 返回列的名称是否包含在集合中

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/// </summary>

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

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/// <returns>如果已经包含，则返回true，否则为false</returns>

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public bool Contains(string columnName)

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{

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return colNames.Contains(colNames);

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}

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/**//// <summary>

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/// 返回列的位置

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/// </summary>

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/// <param name="column">列的实例</param>

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/// <returns>如果没有包含则返回-1，否则从0开始的索引</returns>

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public int IndexOf(Column column)

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{

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return this.IndexOf(column.ColumnName);

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}

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/**//// <summary>

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/// 返回列的位置

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/// </summary>

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/// <param name="column">列的实例</param>

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/// <returns>如果没有包含则返回-1，否则从0开始的索引</returns>

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public int IndexOf(string columnName)

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{

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return colNames.IndexOf(columnName);

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}

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}

下一篇，我们终于可以定义Table了