[求助]在问，求大神求解释。 - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

1、我之本意是：以集合的形式从表中提取手机号码，放文本框中，以打包的方式一次发送出去，因为一条条的刷，吉信通说系统压力过大。

2、运行上面代码，弹出对话框：从类型“List(Of String)”到类型“String”的转换无效。

3、还有 Dim Value As String = Left(s,3) 这怎么理解

Dim tel As String = e.Form.Controls("TextBox3").Value

Dim msg As String = e.Form.Controls("TextBox1").Value

'定义手机,内容两个变量

Dim zh As String = e.Form.Controls("ComboBox1").Value

Dim mm As String = e.Form.Controls("TextBox2").Value

'定义帐号,密码两个变量

If msg Is Nothing Then '如果内容为空

MessageBox.Show("请输入短信的内容", "提示")

Return '退出

Else '不为空,运行下面代码

For Each r As Row In Tables("短信通知").Rows

If r("接收手机").StartsWith("1") = True And r("接收手机").length = 11 Then '如果是手机号提取字符串到 tel变量中

tel = Tables("短信通知").DataTable.GetValues("接收手机" , "接收手机 Like '1%' and Len(接收手机) = 11")

msg = r("短信内容")

Dim url ,s As String

Dim http As Object

url = "http://service.winic.org:8009/sys_port/gateway/?id="& zh &"&pwd="& mm &"&To=" & tel & "&c&time="

'url = "http://service.winic.org:8009/sys_port/gateway/?id="& dr("帐号") &"&pwd="& dr("密码") &"&To=" & dr("接收手机号")& "&c短信内容") &"&time="

http = CreateObject("MSXML2.XMLHTTP")

http.Open("get", url, False)

http.send()

s = http.responseText

Dim Value As String = Left(s,3)

Dim Result As String

Select Case Value

Case "000"

Result = "发送成功!"

Case "-01"

Result = "当前账号余额不足!"

Case "-02"

Result = "当前用户ID错误!"

Case "-03"

Result = "当前密码错误!"

Case "-04"

Result = "参数不够或参数内容的类型错误!"

Case "-05"

Result = "手机号码格式不对!"

Case "-06"

Result = "短信内容编码不对!"

Case "-07"

Result = "短信内容含有敏感字符!"

Case "-08"

Result = "无接收数据!"

Case "-09"

Result = "系统维护中.."

Case "-10"

Result = "手机号码数量超长!(100个/次)"

Case "-11"

Result = "短信内容超长!(70个字符)"

Case "-12"

Result = "其它错误!"

End Select

r("提示信息")= Replace(Replace(Replace(Replace(Replace(s,Value,Result),"Send","本次发送量"),"Consumption","当次消费金额"),"Tmoney","总余额"),"sid","短信编号")

MessageBox.Show("提示信息 : " & r("提示信息"))

End If

主题：[求助]在问，求大神 求解释。

主题：[求助]在问，求大神求解释。