将查询返回到stringbuilder

Question

我只是试图将查询返回到stringbuilder中以生成动态HTML

Partial Class _Default
    Inherits System.Web.UI.Page              
    <WebMethod()> _
    Public Shared Function BuscarTurbos(referencia As String) As String
        Dim sb As StringBuilder = New StringBuilder
        Dim conexion As SqlConnection = New SqlConnection("Data Source=PC-TOSH\misql ;Initial Catalog=Rotomaster;Integrated Security=True")
        conexion.Open()
        Dim cmd As SqlCommand
        cmd = New SqlCommand("SELECT VehicleModel,Year FROM TURBOSNUEVO WHERE TurboModel like '%" + referencia + "%'", conexion)
        Dim dr As SqlDataReader = cmd.ExecuteReader()
        If dr.HasRows Then
            While dr.Read
                sb.Append("<p style='background-color:red;width:50%;height:100px'>'" + dr("VehicleModel").ToString(), CType(dr("Year"), Double) + "' </p>")
            End While
        End If    
        Return sb.ToString    
    End Function
End Class

Answer 1

我会改变你的

sb.Append("<p style='background-color:red;width:50%;height:100px'>'" + dr("VehicleModel").ToString(), CType(dr("Year"), Double) + "' </p>")

到这个：

sb.AppendFormat("<p style='background-color:red;width:50%;height:100px'>{0} {1}</p>", dr("VehicleModel").ToString(), dr("Year").ToString())

关于字符串连接（连接在一起）的注意事项-字符串是不可变的，这意味着每次将字符串连接在一起时，由于无法更改它们，因此必须创建一个新的字符串对象。 通过使用AppendFormat，它使您不必创建额外的字符串对象。