Question

我是LINQ的新手，所以为了开始探索，我创建了一个多线程时间应用程序，以查看更快的LINQ或ADO。这个应用程序计算我工作多久，直到回家的时间。定时器设置为1秒，调用相同的SP。

我错过了什么吗？

Imports System.Data.SqlClient
Imports System.Threading

Public Class Time

Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
    lblADOTime.Text = ADO()
    lblTime.Text = Net()
    lblLinq.Text = tLinq()

End Sub

Private Sub Time_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    Dim tADO As Thread
    Dim tNet As Thread
    Dim tLinq As Thread
    tADO = New Thread(AddressOf Me.ADO)
    tADO.Start()
    tNet = New Thread(AddressOf Me.Net)
    tNet.Start()
    tLinq = New Thread(AddressOf Me.tLinq)
    tLinq.Start()
End Sub
Private Function tLinq() As String
    Dim db As New DataClasses1DataContext
    'db.Connection.Open()

    Dim myDate As String
    myDate = Date.Today + " 17:00:00"
    Return "LINQ: " + db.TimeLeftToday(myDate).ToList().Last.Column1

    'db.Connection.Close()

End Function
Private Function Net() As String
    Dim a As DateTime
    a = Date.Today + " 17:00:00"
    Dim s As String
    s = (a - Now()).ToString
    Return ".NET: " + s 's.Substring(1, 8)

End Function

Private Function ADO() As String
    Try
        Dim conn As New SqlConnection()
        conn.ConnectionString = meh

        Dim cmd As New SqlCommand("TimeLeftToday", conn)

        cmd.CommandText = "TimeLeftToday"
        cmd.CommandType = CommandType.StoredProcedure
        cmd.Parameters.Add(New SqlParameter("@Today", SqlDbType.DateTime, 0, "@Today"))
        cmd.Parameters(0).Value = Date.Today + " 17:00:00"
        cmd.Connection = conn
        conn.Open()
        Dim sdr As SqlDataReader = cmd.ExecuteReader()
        sdr.Read()
        If sdr.HasRows Then

            Return "ADO: " + sdr.GetValue(0)

        End If
        conn.Close()
    Catch ex As Exception
        MsgBox(ex.Message)



    End Try

End Function

End Class

Answer 1

LINQ to SQL在下面使用ADO.NET，因此它无法更快。

你可以问，为什么人们使用它，什么时候性能更差？因为在某些情况下，性能并不是那么重要。你必须管理，LINQ to SQL更容易使用！因为开发过程可以更快，更容易，更友好地开展。

LINQ比ADO更快吗？

1 个答案: