c# Json List<T> DataTable 数据相互转换

List<T>转Json

public static string Obj2Json<T>(T data)
{
    try
    {
        System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(data.GetType());
        using (MemoryStream ms = new MemoryStream())
        {
            serializer.WriteObject(ms, data);
            return Encoding.UTF8.GetString(ms.ToArray());
        }
    }
    catch
    {
        return null;
    }
}

Json转List<T>

public static Object Json2Obj(String json,Type t)
{
    try
    {
        System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(t);
        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(json)))
        {
            
            return  serializer.ReadObject(ms);
        }
    }
    catch
    {
        return null;
    }
}

DataTable 转Json

 

public static string DataTable2Json(DataTable dt)
{
    if (dt.Rows.Count == 0)
    {
        return "";
    }
 
    StringBuilder jsonBuilder = new StringBuilder();
    // jsonBuilder.Append("{"); 
    //jsonBuilder.Append(dt.TableName.ToString());  
    jsonBuilder.Append("[");//转换成多个model的形式
    for (int i = 0; i < dt.Rows.Count; i++)
    {
        jsonBuilder.Append("{");
        for (int j = 0; j < dt.Columns.Count; j++)
        {
            jsonBuilder.Append("\"");
            jsonBuilder.Append(dt.Columns[j].ColumnName);
            jsonBuilder.Append("\":\"");
            jsonBuilder.Append(dt.Rows[i][j].ToString());
            jsonBuilder.Append("\",");
        }
        jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
        jsonBuilder.Append("},");
    }
    jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
    jsonBuilder.Append("]");
    //  jsonBuilder.Append("}");
    return jsonBuilder.ToString();
}

单个对象转JSON

 

 

public static T Json2Obj<T>(string json) 
{
    T obj = Activator.CreateInstance<T>();
    using (System.IO.MemoryStream ms = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(json)))
    {
        System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(obj.GetType());
        return (T)serializer.ReadObject(ms);
    }
}