DataTable
中。然后,JSON DataTable
转换为对象。
我通过调用以下代码来使用this代码:
string result = JsonConvert.SerializeObject(DatatableToDictionary(queryResult, "Title"), Newtonsoft.Json.Formatting.Indented);
要将DataTable转换为JSON,它可以正常工作,并返回以下内容:
{
"1": {
"viewCount": 703,
"clickCount": 98
},
"2": {
"viewCount": 509,
"clickCount": 85
},
"3": {
"viewCount": 578,
"clickCount": 86
},
"4": {
"viewCount": 737,
"clickCount": 108
},
"5": {
"viewCount": 769,
"clickCount": 130
}
}
但我希望它返回以下内容:
{"records":[
{
"Title": 1,
"viewCount": 703,
"clickCount": 98
},
{
"Title": 2,
"viewCount": 509,
"clickCount": 85
},
{
"Title": 3,
"viewCount": 578,
"clickCount": 86
},
{
"Title": 4,
"viewCount": 737,
"clickCount": 108
},
{
"Title": 5,
"viewCount": 769,
"clickCount": 130
}
]}
我该怎么做?
发布于 2013-07-01 13:44:25
Convert Datatable to JSON String in C#, VB.NET中的这段代码可能会对您有所帮助。它使用System.Web.Script.Serialization.JavaScriptSerializer将内容序列化为JSON格式:
public string ConvertDataTabletoString()
{
DataTable dt = new DataTable();
using (SqlConnection con = new SqlConnection("Data Source=SureshDasari;Initial Catalog=master;Integrated Security=true"))
{
using (SqlCommand cmd = new SqlCommand("select title=City,lat=latitude,lng=longitude,description from LocationDetails", con))
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(dt);
System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
Dictionary<string, object> row;
foreach (DataRow dr in dt.Rows)
{
row = new Dictionary<string, object>();
foreach (DataColumn col in dt.Columns)
{
row.Add(col.ColumnName, dr[col]);
}
rows.Add(row);
}
return serializer.Serialize(rows);
}
}
}
发布于 2015-03-02 15:22:33
我们可以通过两种简单的方法来完成这项任务,一种是使用Json.NET动态链接库,另一种是使用StringBuilder类。
使用Newtonsoft Json.NET的
string JSONresult;
JSONresult = JsonConvert.SerializeObject(dt);
Response.Write(JSONresult);
参考链接:Newtonsoft: Convert DataTable to JSON object in ASP.Net C#
使用StringBuilder的
public string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder JsonString = new StringBuilder();
if (ds != null && ds.Tables[0].Rows.Count > 0)
{
JsonString.Append("[");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
JsonString.Append("{");
for (int j = 0; j < ds.Tables[0].Columns.Count; j++)
{
if (j < ds.Tables[0].Columns.Count - 1)
{
JsonString.Append("\"" + ds.Tables[0].Columns[j].ColumnName.ToString() + "\":" + "\"" + ds.Tables[0].Rows[i][j].ToString() + "\",");
}
else if (j == ds.Tables[0].Columns.Count - 1)
{
JsonString.Append("\"" + ds.Tables[0].Columns[j].ColumnName.ToString() + "\":" + "\"" + ds.Tables[0].Rows[i][j].ToString() + "\"");
}
}
if (i == ds.Tables[0].Rows.Count - 1)
{
JsonString.Append("}");
}
else
{
JsonString.Append("},");
}
}
JsonString.Append("]");
return JsonString.ToString();
}
else
{
return null;
}
}
发布于 2015-06-18 02:45:30
这与接受答案的方法类似,但使用LINQ将datatable转换为单行代码中的列表。
//convert datatable to list using LINQ. Input datatable is "dt", returning list of "name:value" tuples
var lst = dt.AsEnumerable()
.Select(r => r.Table.Columns.Cast<DataColumn>()
.Select(c => new KeyValuePair<string, object>(c.ColumnName, r[c.Ordinal])
).ToDictionary(z=>z.Key,z=>z.Value)
).ToList();
//now serialize it
var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
return serializer.Serialize(lst);
这是一种非常有用的枚举datatable的方法,这通常需要大量的编码!以下是一些变体:
//convert to list with array of values for each row
var list1 = dt.AsEnumerable().Select(r => r.ItemArray.ToList()).ToList();
//convert to list of first column values only
var list2 = dt.AsEnumerable().Select(r => r.ItemArray[0]).ToList();
// parse a datatable with conditions and get CSV string
string MalesOver21 = string.Join(",",
dt.AsEnumerable()
.Where(r => r["GENDER"].ToString()=="M" && r.Field<int>("AGE")>21)
.Select(r => r.Field<string>("FULLNAME"))
);
这已经离题了,但是为了完整起见,我要提到的是,如果您只想从现有的数据表中过滤掉行,See this answer
https://stackoverflow.com/questions/17398019
复制相似问题