vb.net 教程 4-11 Json文件操作 2 JavaScriptSerializer

一时失言乱红尘 2022-09-10 12:14 170阅读 0赞

使用JavaScriptSerializer生成和解析json：

设计界面：

其中button1和button3是生成，button2和button4是解析。

项目目标框架选择.net Framework 4.5，添加对system.web.extensions的引用，同时代码中添加：

Imports System.Web.Script.Serialization  
当button1按下时，生成json格式的字符串：

Private Sub Button1\_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click  
        Dim newbooks As New Books  
   
        Dim newBook As New BookStore  
        Dim newSingleBook As New Book  
        newSingleBook.Title = "这是测试"  
        newSingleBook.Author = "作者"  
        newSingleBook.Country = "中国"  
        newSingleBook.Price = 10.2  
        newSingleBook.Year = "1985"  
        newBook.book = newSingleBook  
        newbooks.bookstore = newBook  
   
        Dim serializer As New JavaScriptSerializer  
   
        Dim strNewBook As String  
        strNewBook = serializer.Serialize(newbooks)  
        TextBox1.Text = strNewBook  
   
    End Sub  
当button2按下时将json字符串解析为类：

Private Sub Button2\_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click  
        Dim serializer As New JavaScriptSerializer  
        Dim strNewBook As String = TextBox1.Text  
   
        Dim newBooks As New Books  
        newBooks = serializer.Deserialize(Of Books)(strNewBook)  
   
        TextBox2.Text &= "---------------" & ControlChars.CrLf  
        TextBox2.Text &= "Title：" & newBooks.bookstore.book.Title & ControlChars.CrLf  
        TextBox2.Text &= "Author：" & newBooks.bookstore.book.Author & ControlChars.CrLf  
        TextBox2.Text &= "Country：" & newBooks.bookstore.book.Country & ControlChars.CrLf  
        TextBox2.Text &= "Price：" & newBooks.bookstore.book.Price & ControlChars.CrLf  
        TextBox2.Text &= "Year：" & newBooks.bookstore.book.Year & ControlChars.CrLf  
    End Sub  
生成和解析结果：

在对json字符串进行解析时，设置的类的属性名称请务必与json代码中的键名称相同。

button3生成：

Private Sub Button3\_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click  
        Dim newBooks As New Books1  
        ReDim newBooks.bookstore(2)  
   
        Dim newSingleBook As New Book  
        newSingleBook.Title = "这是测试"  
        newSingleBook.Author = "作者"  
        newSingleBook.Country = "中国"  
        newSingleBook.Price = 10  
        newSingleBook.Year = "1985"  
   
        Dim newBook As New BookStore1  
        newBook.book = newSingleBook  
        newBooks.bookstore(0) = newBook  
   
        newSingleBook = New Book  
        newSingleBook.Title = "这是测试1"  
        newSingleBook.Author = "作者"  
        newSingleBook.Country = "中国"  
        newSingleBook.Price = 11  
        newSingleBook.Year = "1985"  
   
        newBook = New BookStore1  
        newBook.book = newSingleBook  
        newBooks.bookstore(1) = newBook  
   
   
        newSingleBook = New Book  
        newSingleBook.Title = "这是测试2"  
        newSingleBook.Author = "作者"  
        newSingleBook.Country = "中国"  
        newSingleBook.Price = 12  
        newSingleBook.Year = "1985"  
   
        newBook = New BookStore1  
        newBook.book = newSingleBook  
        newBooks.bookstore(2) = newBook  
   
        Dim serializer As New JavaScriptSerializer  
   
        Dim strNewBook As String  
        strNewBook = serializer.Serialize(newBooks)  
        TextBox1.Text = strNewBook  
    End Sub  
button4解析：

Private Sub Button4\_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click  
        Dim serializer As New JavaScriptSerializer  
        Dim strNewBook As String = TextBox1.Text  
   
        Dim newBooks As New Books1  
        newBooks = serializer.Deserialize(Of Books1)(strNewBook)  
   
        For i As Integer = 0 To newBooks.bookstore.Length - 1  
            TextBox2.Text &= "---------------" & ControlChars.CrLf  
            TextBox2.Text &= "Title：" & newBooks.bookstore(i).book.Title & ControlChars.CrLf  
            TextBox2.Text &= "Author：" & newBooks.bookstore(i).book.Author & ControlChars.CrLf  
            TextBox2.Text &= "Country：" & newBooks.bookstore(i).book.Country & ControlChars.CrLf  
            TextBox2.Text &= "Price：" & newBooks.bookstore(i).book.Price & ControlChars.CrLf  
            TextBox2.Text &= "Year：" & newBooks.bookstore(i).book.Year & ControlChars.CrLf  
        Next  
    End Sub

生成和解析结果：

由于.net平台下C\#和vb.NET很相似，本文也可以为C\#爱好者提供参考。

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