如何将json转换为datatable？

Question

有谁知道如何从asp.net将json字符串转换为DataTable？我开始了解Deserialize,它需要类,我只想要返回数据表.谁能告诉我如何将其转换为数据表？

Answer 1

假设您的JSON字符串是对象列表,每个对象将对应于DataTable中的一行,即:

    public DataTable DerializeDataTable()
    {
        const string json = @"[{""Name"":""AAA"",""Age"":""22"",""Job"":""PPP""},"
                           + @"{""Name"":""BBB"",""Age"":""25"",""Job"":""QQQ""},"
                           + @"{""Name"":""CCC"",""Age"":""38"",""Job"":""RRR""}]";
        var table = JsonConvert.DeserializeObject<DataTable>(json);
        return table;
    }

这需要Json.NET框架.

如果您的JSON结构不同,请发布它.最好的祝福.

Answer 2

using Newtonsoft.Json;

string json = "[{"clientID":"1788","projectID":"19"},{"clientID":"1789","projectID":"24"},{"clientID":"1790","projectID":"24"},{"clientID":"1790","projectID":"23"},{"clientID":"1790","projectID":"21"}]";

DataTable tester = (DataTable) JsonConvert.DeserializeObject(json, (typeof(DataTable)));

上述方法的代码

public object Deserialize(string jsonText, Type valueType)
{
    try
    {
        Newtonsoft.Json.JsonSerializer json = new Newtonsoft.Json.JsonSerializer();

        json.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
        json.ObjectCreationHandling = Newtonsoft.Json.ObjectCreationHandling.Replace;
        json.MissingMemberHandling = Newtonsoft.Json.MissingMemberHandling.Ignore;
        json.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;

        StringReader sr = new StringReader(jsonText);

        Newtonsoft.Json.JsonTextReader reader = new JsonTextReader(sr);
        object result = json.Deserialize(reader, valueType);
        reader.Close();
        return result;
    }
    catch (Exception ex)
    {
        throw ex;
    }


}

将jsonstring反序列化为某个类

List<User> UserList = JsonConvert.DeserializeObject<User>(jsonString);

将以下扩展方法写入您的项目

public static DataTable ToDataTable<T>(this IList<T> data)
{
    PropertyDescriptorCollection props =
    TypeDescriptor.GetProperties(typeof(T));
    DataTable table = new DataTable();
    for(int i = 0 ; i < props.Count ; i++)
    {
    PropertyDescriptor prop = props[i];
    table.Columns.Add(prop.Name, prop.PropertyType);
    }
    object[] values = new object[props.Count];
    foreach (T item in data)
    {
    for (int i = 0; i < values.Length; i++)
    {
        values[i] = props[i].GetValue(item);
    }
    table.Rows.Add(values);
    }
    return table;        
}

调用扩展方法就好

UserList.ToDataTable<User>();