Visualforce Developer Guide
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getParameters()
Returns a map of the query string parameters for the PageReference; both POST and GET
parameters are included. The key string contains the name of the parameter, while the value
string contains the value of the parameter.
Signature
public Map<String, String> getParameters()
Return Value
Type: Map<String, String>
Usage
This map can be modified and remains in scope for the PageReference object. For instance, you could do:
PageReference.getParameters().put('id', myID);Parameter keys are case-insensitive. For example:
System.assert(
ApexPages.currentPage().getParameters().get('myParamName') ==
ApexPages.currentPage().getParameters().get('myparamname'));