将字符串转换为自定义对象列表

Question

假设我有一个对象 Fish，其属性如下：

Public Property ID As Integer
Public Property Name As String
Public Property Type As Integer
Public Property Age As Integer

我有一个看起来像这样的字符串：

"Fishes[0].ID=1&Fishes[0].Name=Fred&Fishes[0].Type=1&Fishes[0].Age=3&Fishes[1].ID=2&Fishes[1].Name=George&Fishes[1].Type=2&Fishes[1].Age=5&..."

有什么方法可以将我的字符串转换/转换/任何内容转换为 Fish 对象列表吗？我似乎找不到任何帮助。如果这会让事情变得更容易，我确实可以控制字符串的格式。

非常感谢

Answer 1

在您提到的 cmets 中，这是通过 ASP.Net MVC 实现的。 ModelBinder 将为您做所有事情。

public ActionResult UpdateFish(IList<Fish> listOfFish)
    {
        //the ModelBinder will figure out that the user has posted a list of Fish instances.
        //do something with listOfFish
        return View(listOfFish);
    }

Answer 2

您需要做的是解析输入字符串以查找Fishes[X].PROPNAME=VALUE 模式。循环遍历字符串中找到的所有匹配项，并添加或设置 Dictionary 中的现有对象。使用X 作为字典中的每个对象键。

创建鱼结构：

Structure Fish
    Public ID As String
    Public Name As String
    Public Type As Integer
    Public Age As Integer
End Structure

处理输入字符串的代码：

Dim Fishes As New Dictionary(Of String, Fish)
Dim m As Match = Regex.Match(str, "Fishes\[(?<key>\d+)]\.(?<prop>.+?)=(?<value>[^&]+)", RegexOptions.IgnoreCase)

Do While m.Success
    Dim key As String = m.Groups("key").Value.Trim.ToUpper
    Dim prop As String = m.Groups("prop").Value.Trim.ToUpper
    Dim value As String = m.Groups("value").Value

    ' if the key not yet exist in the Dictionary, create and add into it.
    If Not Fishes.ContainsKey(key) Then
        Fishes.Add(key, New Fish)
    End If

    Dim thisFish As Fish = Fishes(key) ' get the Fish object for this key

    ' determine the object property to set
    Select Case prop
        Case "ID" : thisFish.ID = value
        Case "NAME" : thisFish.Name = value
        Case "TYPE" : thisFish.Type = CInt(value)
        Case "AGE" : thisFish.Age = CInt(value)
    End Select

    Fishes(key) = thisFish ' since the Fish object is declared as Structure,
                           ' update the Dictionary item of key with the modified object.
                           ' If Fish is declared as Class, then this line is useless

    m = m.NextMatch()
Loop

Answer 3

这是vb.net转换的

Public Partial Class test
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(sender As Object, e As EventArgs)


        If Not IsPostBack Then
        End If

    End Sub
    Public Sub MYtest()
        Dim ls As New List(Of Fish)()
        Dim f As New Fish()
        f.ID = 1
        f.Name = "My name"
        f.Type = "My type"
        f.Age = 20
        ls.Add(f)
    End Sub
End Class
Public Class Fish
    Public Property ID() As Integer
        Get
            Return m_ID
        End Get
        Set
            m_ID = Value
        End Set
    End Property
    Private m_ID As Integer
    Public Property Name() As String
        Get
            Return m_Name
        End Get
        Set
            m_Name = Value
        End Set
    End Property
    Private m_Name As String
    Public Property Type() As String
        Get
            Return m_Type
        End Get
        Set
            m_Type = Value
        End Set
    End Property
    Private m_Type As String
    Public Property Age() As Integer
        Get
            Return m_Age
        End Get
        Set
            m_Age = Value
        End Set
    End Property
    Private m_Age As Integer
End Class

Answer 4

试试这个..

Structure Test
    Dim ID As String
    Dim Name As String
    Dim Type As Integer
    Dim Age As Integer
End Structure

在您的按钮点击事件中..

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Dim Fishes As New List(Of Test)

    Dim Fish As New Test
    Fish.ID = "GF"
    Fish.Name = "Gold Fish"
    Fish.Age = 1
    Fish.Type = 1
    Fishes.Add(Fish)

    MsgBox(Fishes(0).Name)

End Sub