将字典列表转换为数据表 [英] Coverting List of Dictionary to DataTable
本文介绍了将字典列表转换为数据表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
目前我们通过循环遍历列表和字典的每个值来做到这一点:
Currently we are doing this by looping through each value of list and dictionary:
private DataTable ChangeToDictionary(List<Dictionary<string,int>> list)
{
DataTable datatTableReturn = new DataTable();
if (list.Count() > 0)
{
Dictionary<string, int> haeders = list.ElementAt(0);
foreach (var colHead in haeders)
{
datatTableReturn.Columns.Add(colHead.Key);
}
}
foreach (var row in list)
{
DataRow dataRow = datatTableReturn.NewRow();
foreach (var col in row)
{
dataRow[col.Key] = col.Value;
}
datatTableReturn.Rows.Add(dataRow);
}
return datatTableReturn;
}
但是有更好的方法吗?循环这么多次感觉不太好
But is there a better way? Looping through so many times doesn't feel good
推荐答案
以上答案没有解决字典超过 1 行的问题.此解决方案解决了该问题.
The answers above don't address the issue of the dictionary having more than 1 row. This solution addresses the issue.
static DataTable ToDataTable(List<Dictionary<string, int>> list)
{
DataTable result = new DataTable();
if (list.Count == 0)
return result;
var columnNames = list.SelectMany(dict=>dict.Keys).Distinct();
result.Columns.AddRange(columnNames.Select(c=>new DataColumn(c)).ToArray());
foreach (Dictionary<string,int> item in list)
{
var row = result.NewRow();
foreach (var key in item.Keys)
{
row[key] = item[key];
}
result.Rows.Add(row);
}
return result;
}
static void Main(string[] args)
{
List<Dictionary<string, int>> it = new List<Dictionary<string, int>>();
Dictionary<string, int> dict = new Dictionary<string, int>();
dict.Add("a", 1);
dict.Add("b", 2);
dict.Add("c", 3);
it.Add(dict);
dict = new Dictionary<string, int>();
dict.Add("bob", 34);
dict.Add("tom", 37);
it.Add(dict);
dict = new Dictionary<string, int>();
dict.Add("Yip Yip", 8);
dict.Add("Yap Yap", 9);
it.Add(dict);
DataTable table = ToDictionary(it);
foreach (DataColumn col in table.Columns)
Console.Write("{0} ", col.ColumnName);
Console.WriteLine();
foreach (DataRow row in table.Rows)
{
foreach (DataColumn column in table.Columns)
Console.Write("{0} ", row[column].ToString());
Console.WriteLine();
}
Console.ReadLine();
}
输出看起来像...
a b c bob tom Yip Yip Yap Yap
1 2 3
34 37
8 9
这篇关于将字典列表转换为数据表的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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