List <T>的动态类型？

Question

我有一个方法返回DataSet表的List

public static List<string> GetListFromDataTable(DataSet dataSet, string tableName, string rowName)
    {
        int count = dataSet.Tables[tableName].Rows.Count;
        List<string> values = new List<string>();

        // Loop through the table and row and add them into the array
        for (int i = 0; i < count; i++)
        {
            values.Add(dataSet.Tables[tableName].Rows[i][rowName].ToString());
        }
        return values;
    }

有没有办法可以动态设置列表的数据类型,并且这个方法适合所有数据类型,所以我可以在调用此方法时指定它应该是List<int> List<string>或者List<AnythingILike>？

另外,在声明方法时返回类型是什么？

先谢谢,布雷特

Answer 1

使您的方法通用:

public static List<T> GetListFromDataTable<T>(DataSet dataSet, string tableName, string rowName)
{
    // Find out how many rows are in your table and create an aray of that length
    int count = dataSet.Tables[tableName].Rows.Count;
    List<T> values = new List<T>();

    // Loop through the table and row and add them into the array
    for (int i = 0; i < count; i++)
    {
        values.Add((T)dataSet.Tables[tableName].Rows[i][rowName]);
    }
    return values;
}

然后叫它:

List<string> test1 = GetListFromDataTable<string>(dataSet, tableName, rowName);
List<int> test2 = GetListFromDataTable<int>(dataSet, tableName, rowName);
List<Guid> test3 = GetListFromDataTable<Guid>(dataSet, tableName, rowName);