并非原创，在网上找到的，没找到出处

调用的时候直接string json = JavaScriptConvert.SerializeObject(ds, new DataSetConverter());

下面是DataSetConverter这个类的实现

public class DataSetConverter : JsonConverter

{

public override bool CanConvert(Type objectType)

{

return typeof(DataSet).IsAssignableFrom(objectType);

}

public override void WriteJson(JsonWriter writer, object value)

{

DataSet ds = (DataSet)value;

writer.WriteStartObject();

foreach (DataTable dt in ds.Tables)

{

writer.WritePropertyName(dt.TableName);

writer.WriteStartArray();

foreach (DataRow dr in dt.Rows)

{

writer.WriteStartObject();

foreach (DataColumn dc in dt.Columns)

{

writer.WritePropertyName(dc.ColumnName);

writer.WriteValue(dr[dc].ToString());

}

writer.WriteEndObject();

}

writer.WriteEndArray();

}

writer.WriteEndObject();

}

public override object ReadJson(JsonReader reader, Type objectType)

{

throw new NotImplementedException();

}

}