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You can typically find the WCF Test Client (WcfTestClient.exe) in the following location: C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE - Community may be one of "Enterprise", "Professional" or "Community" depending on which level of Visual Studio is installed.
A WCF client is a local object that represents a WCF service in a form that the client can use to communicate with the remote service. WCF client types implement the target service contract, so when you create one and configure it, you can then use the client object directly to invoke service operations.
Type length=1 in the box. A + sign will appear next to the request parameter name. Click on it, then on the [0] node which indicates the first element in the array and set its values as usual.
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