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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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}
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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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}
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下一篇,我们终于可以定义Table了