Question

我使用<ScriptMethod(ResponseFormat:=ResponseFormat.Json)>自动格式化我Return作为json格式输出。

但是，我认为我做的不仅仅是因为我首先将DataSet的内容转储到Dictionary，而Return转移Dictionary。< / p>

如果我在列上使用了别名并希望输出所有列，是否可以像Return一样DataSet Dictionary？如果没有，我怎么能用尽可能少的行来做到这一点？

Dim conn As New SqlConnection
conn.ConnectionString = Module1.DBConn2
Dim sqlCommand = New SqlCommand("Select id, column1, column2... From table1", conn)
    conn.Open()
    Dim sqlDataset As DataSet = New DataSet()
    Dim sqlDataAdapter As SqlDataAdapter = New SqlDataAdapter(sqlCommand)
    sqlDataAdapter.Fill(sqlDataset)
    conn.Close()

    Dim jsonDict(sqlDataset.Tables(0).Rows.Count - 1) As Dictionary(Of Object, Object)
    Dim i As Integer = 0
    For Each rs As DataRow In sqlDataset.Tables(0).Rows
        jsonDict(i) = New Dictionary(Of Object, Object)
        jsonDict(i).Add("id", rs.Field(Of Object)("id"))
        jsonDict(i).Add("column1", rs.Field(Of Object)("column1"))
        jsonDict(i).Add("column2", rs.Field(Of Object)("column2"))
        ...
    i = i + 1
Next
Return jsonDict

Answer 1

你可以按id（主键）获取每一行：将返回类型更改为数据表

return sqlDataset.Tables(0);

此链接可以帮助您link

或此link

Answer 2

1. pass the array of DataSets to a web service web method that
takes a DataSet as a parameter.

例如：

[webmethod]
public static void(Dataset[] a)
{
// do something
}

您也可以使用xml操作来填充数据集：

2. Use the DataSet.GetXML method (which returns an XML string representing
the DataSet) and pass that string to a web service web method. Then that
web method would declare a new DataSet and using the ReadXML method, it
could read the XML string into itself. You will need to load the XML string
into an XMLDocument and then pass it to an XMLNodeReader so that it can be
read into the DataSet using ReadXML.

3. fill up each dataset from the array. and pick a dataset through loop operation and after picking the dataset get the table in that dataset. finally you can get the row using the process as below(if needed):

DataRow dr;
Dataset ds;
DataTable dt;

dt = ds.Tables(0);
foreach(dr in ds.tables(0).rows){
// dr("ColName") to get value;
}

在WebMethod中返回DataSet的关联数组？

2 个答案: