关于switch语句的问题，内有代码

ChoiceDialog[请问您有几个准则, {1 -> 1, 2 -> 2, 3 -> 3, 4 -> 4, 5 -> 5,
6 -> 6, 7 -> 7, 8 -> 8, 9 -> 9}]
Switch [
ChoiceDialog[请问您有几个准则
{1 -> 1, 2 -> 2, 3 -> 3, 4 -> 4, 5 -> 5, 6 -> 6, 7 -> 7, 8 -> 8,
9 -> 9}],
1, CreateDialog[
{TextCell["第1个准则"], InputField[Dynamic[准1], String],
DefaultButton
[DialogReturn[ret = 准1]]}
],
2, [ CreateDialog[
{TextCell["第1个准则"], InputField[Dynamic[准1], String],
TextCell["第2个准则"], InputField[Dynamic[准2], String],
DefaultButton
[DialogReturn[ret = 准1]
DialogReturn[ret = 准2]
]}
]]
3, [ CreateDialog[
{TextCell["第1个准则"], InputField[Dynamic[准1], String],
TextCell["第2个准则"], InputField[Dynamic[准2], String],
TextCell["第3个准则"], InputField[Dynamic[准3], String],
DefaultButton
[DialogReturn[ret = 准1]
DialogReturn[ret = 准2]
DialogReturn[ret = 准3]
]}
]]
怎样调整才能使其运行?