Question

所以我试着学习c＃，因为我想改变我的旧编程技巧，即vb.net我打开一些转换器网站，但它不起作用。我只是想知道在vb.net中使用和WITH的代码到c＃。

这是我在vb.net中的代码：

Dim rand As New Random
    abuildnumber.Text = rand.Next
    Dim exist As String = String.Empty
    exist &= "select * from stocks "
    exist &= "where build_number=@build"
    Using conn As New SqlConnection("server=WIN10;user=admin;password=12345;database=pc_parts")
        Using cmd As New SqlCommand
            With cmd
                .Connection = conn
                .CommandType = CommandType.Text
                .CommandText = exist
                .Parameters.AddWithValue("@build", abuildnumber.Text)
            End With
            Try
                conn.Open()
                Dim reader As SqlDataReader = cmd.ExecuteReader
                If reader.HasRows Then
                    reader.Close()
                    abuildnumber.Text = rand.Next
                End If
                abrand.Enabled = True
                apart.Enabled = True
                aquantity.Enabled = True
                aday.Enabled = True
                amonth.Enabled = True
                ayear.Enabled = True
                add.Enabled = True
                conn.Close()
            Catch ex As Exception
                MsgBox(ex.Message)
            End Try
        End Using
    End Using
End Sub

Answer 1

在C＃中，using的语法基本相同：

// Notice single lined, or multi lined using statements { }
using (var conn = new SqlConnection("server=WIN10;user=admin;password=12345;database=pc_parts"))
  using (var cmd = new SqlCommand())  
  {

  }

值得庆幸的是，C＃

中没有With等价物

Answer 2

使用语法非常相似：

using (conn As new SqlConnection("server=WIN10;user=admin;password=12345;database=pc_parts"))
{
    // some code here
}

我不确定是否有一种直接的方法可以用“With”做你正在做的事情。但是，您可以在对象声明中内联赋值，如下所示：

cmd = new SqlCommand {
    Connection = conn,
    CommandType = CommandType.Text,
    CommandText = exist
};
cmd.Parameters.AddWithValue("@build", abuildnumber.Text);

vb.net代码USING和WITH c＃的代码是什么

2 个答案: