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HttpRequest事件里的Return作用咨询  发帖心情 Post By:2017/5/13 19:15:00 [只看该作者]

帮助里的标准Weui框架代码是

 

HttpRequest:

'通用事件头,用于发送已经存在的常见文件
Dim
fl As String = "d:\web\" & e.path
If
filesys.FileExists(fl)
    Dim idx As Integer = fl.LastIndexOf(".")
    Dim ext As String  = fl.SubString(idx)
    Select Case ext
        Case ".jpg",".gif",".png",".bmp",".wmf",".js",".css" ,".html",".htm",".zip",".rar"
            e.WriteFile(fl)
            Return
'这里必须返回
    End
Select
End
If
'
以下是动态生成网页的代码
Dim
wb As New WeUI '定义一个基于weui框架的网页生成器
Select
Case e.Path
    Case "addnew.htm",""
        wb.InsertHTML(
"这是默认页面addnew.htm")   
    Case "order.htm"
        wb.InsertHTML(
"这是普通页面order.htm")   
End
Select
e
.WriteString(wb.Build) '生成网页

---------------------------------------------------------------

 

由于我不想经常打开网络管理器(速度太慢),我这样写,可以吗

 

①HttpRequest:

'通用事件头,用于发送已经存在的常见文件
Functions.Execute("Web_GetBasic",e)

 

'以下是动态生成网页的代码
Dim
wb As New WeUI '定义一个基于weui框架的网页生成器
Select
Case e.Path
    Case "addnew.htm",""
        wb.InsertHTML(
"这是默认页面addnew.htm")   
    Case "order.htm"
        wb.InsertHTML(
"这是普通页面order.htm")   
End
Select
e
.WriteString(wb.Build) '生成网页

 

②内部函数Web_GetBasic:

Dim e As RequestEventArgs = args(0)
Dim fl As String = ProjectPath & "HYWeb\" & e.path
If filesys.FileExists(fl)
    Dim idx As Integer = fl.LastIndexOf(".")
    Dim ext As String  = fl.SubString(idx)
    Select Case ext
        Case ".jpg",".gif",".png",".bmp",".wmf",".js",".css" ,".html",".htm",".zip",".rar",".txt"
            e.WriteFile(fl)
            Return "" '这里必须返回
    End Select
End If

 

---------------------------------------------------------------

再后来我觉得打开网络管理器修改生成网页代码也太麻烦,变成

 

①HttpRequest:

Functions.Execute("Web_Main",e)

 

②内部函数Web_Main:

Dim e As RequestEventArgs = Args(0)

 

Functions.Execute("Web_GetBasic",e) '通用事件,获取必要的文件如 css js 等

 

Dim wb As New weui '引用WeUi框架

'以下是动态生成网页的代码
Dim
wb As New WeUI '定义一个基于weui框架的网页生成器
Select
Case e.Path
    Case "addnew.htm",""
        wb.InsertHTML(
"这是默认页面addnew.htm")   
    Case "GetItemSmallClassName.htm"
        Functions.Execute("Web_GetItemSmallClassName",e)

End Select
e
.WriteString(wb.Build) '生成网页

 

内部函数Web_GetBasic:

Dim e As RequestEventArgs = args(0)
Dim fl As String = ProjectPath & "HYWeb\" & e.path
If filesys.FileExists(fl)
    Dim idx As Integer = fl.LastIndexOf(".")
    Dim ext As String  = fl.SubString(idx)
    Select Case ext
        Case ".jpg",".gif",".png",".bmp",".wmf",".js",".css" ,".html",".htm",".zip",".rar",".txt"
            e.WriteFile(fl)
            Return "" '这里必须返回
    End Select
End If

 

④内部函数Web_GetItemSmallClassName:

Dim e As RequestEventArgs = Args(0)

Dim pps As String = DataTables("商品档案").SQLGetComboListString("小类名称","大类名称='" & e.PostValues("大类名称") & "'","小类名称")
e.WriteString("|" & pps)

 

 

以上3种写法,不知道有没问题,会不会有什么隐患,因为这个Return,最大的疑问点就是在这个Return上,最原始是直接在HttpRequest事件里,它可以终止了整个HttpRequest事件,HttpRequest恰恰又是个会重复响应请求的事件,对流程的控制要求非常严格,但是我抽取到内部函数以后,它就变了只终止内部函数,但是外面的整个事件还是在继续执行。这样的写法好吗?求老师给一个比较规范的方法,例如那些可以写内部函数里,那些必须外置。


 

[此贴子已经被作者于2017/5/13 19:20:39编辑过]

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