Question

当我尝试序列化自定义数据集时出现此错误。我做错了什么，乖乖它应该很简单？

由于

错误序列化“System.Globalization.CultureInfo”类型的对象时检测到循环引用。

 Dim serializer As New JavaScriptSerializer()
            Dim arrayJson As String = serializer.Serialize(makeMYDataSET())

    Private Function makeMYDataSET() As DataSet


        ' Two DataTables.
        Dim table1 As DataTable = New DataTable("patients")
        table1.Columns.Add("name")
        'table1.Columns.Add("id")
        table1.Rows.Add("sam")
        table1.Rows.Add("mark")
        table1.Rows.Add("hjhkhkh")

        Dim table2 As DataTable = New DataTable("medications")
        'table2.Columns.Add("id")
        table2.Columns.Add("medication")
        table2.Rows.Add("atenolol")
        table2.Rows.Add("amoxicillin")

        ' Create a DataSet. Put both tables in it.
        Dim set1 As DataSet = New DataSet("office")
        set1.Tables.Add(table1)
        set1.Tables.Add(table2)


        Return set1

    End Function

Answer 1

无法在普通JavaScriptSerializer上使用DataSet。

一种方法是将您的DataSet转换为XML，或者更好，首先将其转换为Dictionary。

您可以使用此方法（来自CodeProject的示例）：

Function DataSetToJSON(ds As DataSet) As String
    Dim dict = New Dictionary(Of String, Object)

    For Each dt As DataTable In ds.Tables
        Dim arr(dt.Rows.Count) As Object

        For i = 0 To dt.Rows.Count - 1
            arr(i) = dt.Rows(i).ItemArray
        Next

        dict.Add(dt.TableName, arr)
    Next

    Dim json = New JavaScriptSerializer
    Return json.Serialize(dict)
End Function

示例

DataSetToJSON(makeMYDataSET())

<强>结果

{ “患者”：[[ “SAM”]，[ “标记”]，[ “hjhkhkh”]，空]， “药物”：[[ “阿替洛尔”]，[ “阿莫西林”]，空]}

Answer 2

DataSet somedataset;
XmlSerializer s = new XmlSerializer(typeof(Dataset));
StringWriter sw = new StringWriter();
s.Serialize(sw, somedataset);
string serialized = sw.ToString();

我认识它，但它确实有效关于javascriptserialzer类，我之前没有使用它，但我认为它与xmlserializer有关。

序列化数据集vb.net错误

2 个答案: