泛型轉DataTable方法

哈哈哈哈哈我撒發表於2009-09-01
泛型

/// 將集合類轉換成DataTable
    /// </summary>
    /// <param name="list">集合</param>
    /// <returns></returns>
    public DataTable ToDataTable(List<GongGaoInfo> list)
    {
        DataTable result = new DataTable();
        if (list.Count > 0)
        {
            PropertyInfo[] propertys = list[0].GetType().GetProperties();
            foreach (PropertyInfo pi in propertys)
            {
                result.Columns.Add(pi.Name, pi.PropertyType);
            }
            for (int i = 0; i < list.Count; i++)
            {
                ArrayList tempList = new ArrayList();
                foreach (PropertyInfo pi in propertys)
                {
                    object obj = pi.GetValue(list[i], null);
                    tempList.Add(obj);
                }
                object[] array = tempList.ToArray();
                result.LoadDataRow(array, true);
            }
        }
        return result;
    }

 

/// <summary>
/// 將集合類轉換成DataTable
/// </summary>
/// <param name="list">集合</param>
/// <returns></returns>
public static DataTable ToDataTable(IList list)
{
    DataTable result = new DataTable();
    if (list.Count > 0)
    {
        PropertyInfo[] propertys = list[0].GetType().GetProperties();
        foreach (PropertyInfo pi in propertys)
        {
            result.Columns.Add(pi.Name, pi.PropertyType);
        }
        for (int i = 0; i < list.Count; i++)
        {
            ArrayList tempList = new ArrayList();
            foreach (PropertyInfo pi in propertys)
            {
                object obj = pi.GetValue(list, null);
                tempList.Add(obj);
            }
            object[] array = tempList.ToArray();
            result.LoadDataRow(array, true);
        }
    }
    return result;
}
/**//// <summary>
/// 將泛型集合類轉換成DataTable
/// </summary>
/// <typeparam name="T">集合項型別</typeparam>
/// <param name="list">集合</param>
/// <returns>資料集(表)</returns>
public static DataTable ToDataTable<T>(IList<T> list)
{
    return  ConvertX.ToDataTable<T>(list, null);
}
/**//// <summary>
/// 將泛型集合類轉換成DataTable
/// </summary>
/// <typeparam name="T">集合項型別</typeparam>
/// <param name="list">集合</param>
/// <param name="propertyName">需要返回的列的列名</param>
/// <returns>資料集(表)</returns>
public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName)
{
    List<string> propertyNameList = new List<string>();
    if (propertyName != null)
        propertyNameList.AddRange(propertyName);
    DataTable result = new DataTable();
    if (list.Count > 0)
    {
        PropertyInfo[] propertys = list[0].GetType().GetProperties();
        foreach (PropertyInfo pi in propertys)
        {
            if (propertyNameList.Count == 0)
            {
                result.Columns.Add(pi.Name, pi.PropertyType);
            }
            else 
            {
                if (propertyNameList.Contains(pi.Name))
                    result.Columns.Add(pi.Name, pi.PropertyType);
            }
        }
        for (int i = 0; i < list.Count; i++)
        {
            ArrayList tempList = new ArrayList();
            foreach (PropertyInfo pi in propertys)
            {
                if (propertyNameList.Count == 0)
                {
                    object obj = pi.GetValue(list, null);
                    tempList.Add(obj);
                }
                else
                {
                    if (propertyNameList.Contains(pi.Name))
                    {
                        object obj = pi.GetValue(list, null);
                        tempList.Add(obj);
                    }
                }
            }
            object[] array = tempList.ToArray();
            result.LoadDataRow(array, true);
        }
    }
    return result;
}

程式的重用性，完美的體現了

 

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