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---- [求助]要使combobox控件显示为空该用什么代码？ (http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=56628)
-- 发布时间：2014/9/10 9:18:00
-- [求助]要使combobox控件显示为空该用什么代码？
我的代码是
Dim a As WinForm.TextBox = e.Form.Controls("combobox1")
a.text = ""
但是会出现错误：从字符串“123123”到类型“Double”的转换无效。
-- 发布时间：2014/9/10 9:20:00
--
这个代码没道理会出现这个错误.错误肯定在其他地方.其他代码.
上个例子看看吧
-- 发布时间：2014/9/10 9:20:00
--
e.Form.Controls("combobox1").Text = ""
-- 发布时间：2014/9/10 9:23:00
--
先有一个窗口的afterload属性
If DataTables("入库主表").DataRows.Count <> 0 Then \'\'主表有值的情况下
Dim a As String = Tables("入库主表").Current("购进单据号")
Dim b As WinForm.DateTimePicker = e.Form.Controls("gjsr")
Dim c As WinForm.ComboBox = e.Form.Controls("ghs")
Dim d As WinForm.TextBox = e.Form.Controls("cgr")
Dim f As WinForm.TextBox = e.Form.Controls("zy")
Dim g As WinForm.TextBox = e.Form.Controls("zdr")
Dim h As WinForm.TextBox = e.Form.Controls("shdh")
Tables("入库单_t1").Filter = "购进单据号 = \'" & a & "\'"
b.text = Tables("入库主表").Current("购进日期")
c.text = Tables("入库主表").Current("供应商")
d.text = Tables("入库主表").Current("采购人")
f.text = Tables("入库主表").Current("摘要")
g.text = Tables("入库主表").Current("制单人")
h.text = Tables("入库主表").Current("随货单号")
Else
Dim b1 As WinForm.DateTimePicker = e.Form.Controls("gjsr")
Dim g1 As WinForm.TextBox = e.Form.Controls("zdr")
b1.Value = Date.Today()
g1.Value = User.Name
End If
然后问题出现在新增的时候，以下是新增按钮的代码
If DataTables("入库主表").DataRows.Count = 0 Then \'\'主表无记录的情况
Tables("入库主表").AddNew
Dim a As String = Tables("入库主表").Current("购进单据号")
Dim b As WinForm.DateTimePicker = e.Form.Controls("gjsr")
Dim c As WinForm.TextBox = e.Form.Controls("zdr")
b.Value = Date.Today()
c.Value = User.Name
Tables("入库主表").Current("购进日期") = b.Value
Tables("入库单_t1").Filter = "购进单据号 = \'" & a & "\'"
Else
If Tables("入库主表").Current("供应商") <> 0 Then \'\'主表有记录且有值
Tables("入库主表").AddNew
Dim a1 As String = Tables("入库主表").Current("购进单据号")
Dim b1 As WinForm.DateTimePicker = e.Form.Controls("gjsr")
Dim d As WinForm.ComboBox = e.Form.Controls("ghs")
Dim f As WinForm.TextBox = e.Form.Controls("cgr")
Dim g As WinForm.TextBox = e.Form.Controls("zy")
Dim c1 As WinForm.TextBox = e.Form.Controls("zdr")
Dim h As WinForm.TextBox = e.Form.Controls("shdh")
b1.Value = Date.Today()
c1.Value = User.Name
d.text = ""
f.text = ""
g.text = ""
h.text = ""
Tables("入库主表").Current("购进日期") = b1.Value
Tables("入库单_t1").Filter = "购进单据号 = \'" & a1 & "\'"
Else \'有记录无值的情况
Dim a2 As String = Tables("入库主表").Current("购进单据号")
MessageBox.Show( a2 & "已经是新的出库单无需继续新增","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If
End If
-- 发布时间：2014/9/10 9:26:00
--
你是操作哪里出现的错误,错误的提示截图出来看看.(记得要点击显示详细信息)
-- 发布时间：2014/9/10 9:30:00
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就是这个
此主题相关图片如下：qq图片20140910093135.jpg
-- 发布时间：2014/9/10 9:31:00
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http://www.foxtable.com/help/topics/1485.htm
-- 发布时间：2014/9/10 9:31:00
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对应4楼的第二段代码，那就是Button5的click时间
-- 发布时间：2014/9/10 9:34:00
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自己排查一下错误
http://www.foxtable.com/help/topics/1485.htm
-- 发布时间：2014/9/10 10:23:00
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还是搞不定找到有问题的代码了，但是不知道接下来该怎么办，有问题的代码如下（红色表示）
If Tables("入库主表").Current("供应商") <> 0 Then \'\'主表有记录且有值
Tables("入库主表").AddNew
Dim a1 As String = Tables("入库主表").Current("购进单据号")
Dim b1 As WinForm.DateTimePicker = e.Form.Controls("gjsr")
Dim d As WinForm.ComboBox = e.Form.Controls("ghs")
Dim f As WinForm.TextBox = e.Form.Controls("cgr")
Dim g As WinForm.TextBox = e.Form.Controls("zy")
Dim c1 As WinForm.TextBox = e.Form.Controls("zdr")
Dim h As WinForm.TextBox = e.Form.Controls("shdh")
b1.Value = Date.Today()
c1.Value = User.Name
d.text = ""
f.text = ""
g.text = ""
h.text = ""
Tables("入库主表").Current("购进日期") = b1.Value
Tables("入库单_t1").Filter = "购进单据号 = \'" & a1 & "\'"
随便问下，那个output命令窗口在哪打开啊？