C# 根据DataTable 转换成JSON 文本字符串数据

public string DataTable2Json(DataTable data)
{
    System.Collections.ArrayList dic = new System.Collections.ArrayList();
    foreach (DataRow row in data.Rows)
    {
        System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
        foreach (DataColumn dc in data.Columns)
        {
            drow.Add(dc.ColumnName, row[dc.ColumnName]);
        }
        dic.Add(drow);
    }
    string json = Newtonsoft.Json.JsonConvert.SerializeObject(dic, Newtonsoft.Json.Formatting.Indented);
    return json;
}

public string DataTable2Json(List<DataRow> data)
{
    System.Collections.ArrayList dic = new System.Collections.ArrayList();
    foreach (DataRow row in data.Rows)
    {
        System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
        foreach (DataColumn dc in data.Columns)
        {
            drow.Add(dc.ColumnName, row[dc.ColumnName]);
        }
        dic.Add(drow);
    }
    string json = Newtonsoft.Json.JsonConvert.SerializeObject(dic, Newtonsoft.Json.Formatting.Indented);
    return json;
}

System.Collections.ArrayList dic = new System.Collections.ArrayList();
foreach (DataGridViewRow o in dataGridView1.SelectedRows)
{
    DataRow row = (o.DataBoundItem as DataRowView).Row;
    System.Collections.Generic.Dictionary<string, object> drow = new System.Collections.Generic.Dictionary<string, object>();
    foreach (DataColumn dc in row.Table.Columns)
    {
        drow.Add(dc.ColumnName, row[dc.ColumnName]);
    }
    dic.Add(drow);
}

string json = Newtonsoft.Json.JsonConvert.SerializeObject(dic, Newtonsoft.Json.Formatting.Indented);