ADF V2 creating a Generic Linked Service framework

Question

I am creating a parameterized Linked Service connection frame work for ADF V2 Flat file sources below is my advanced JSON script

I am getting this error while publishing the linked Service

The property 'userid' in the payload cannot be null or empty.

any idea why ??

{
    "name": "LS_FileServer",
    "type": "Microsoft.DataFactory/factories/linkedservices",
    "properties": {

"parameters": {
            "FileServerPath": {
                "type": "String",
                "defaultValue": "\\\\tmdwmart\\Inbound_Production\\MCF"
},
"File_Name": {
                "type": "String",
                "defaultValue": "AccessValue.csv"
},

    "user_name": {
                "type": "String",
                "defaultValue": "tbecu\\khanaz"
            },
"kv_secret": {
                "type": "string",
                "defaultValue": "MCFAccessValue"
            }
},
        "annotations": [],
        "type": "FileServer",
        "typeProperties": {
      "connectionString": "Integrated Security=True;Data Source=@{linkedService().FileServerPath };Initial Catalog=@{linkedService().File_Name}",
            "UserName": "@{linkedService().user_name}",
            "password": {
                "type": "AzureKeyVaultSecret",
                "store": {
                    "referenceName": "AzureKeyVault2",
                    "type": "LinkedServiceReference"
                },
                "secretName": {
                    "value": "@linkedService().kv_secret",
                    "type": "Expression"
                }
            }



        },
        "connectVia": {
            "referenceName": "WSRB08968",
            "type": "IntegrationRuntimeReference"
        }
    }
}

Answer 1

I worked with Martin jaffer from MS to get this resolved.
Below is the correct script which corrected the error

"name": "FileServer1",
"type": "Microsoft.DataFactory/factories/linkedservices",
"properties": {
"type": "FileServer",
"parameters": {
"FileServerPath": {
"type": "String",
"defaultValue": "\\tmdwmart\Inbound_Production\MCF"
},
"File_Name": {
"type": "String",
"defaultValue": "AccessValue.csv"
},
"user_name": {
"type": "String",
"defaultValue": "tbecu\khanaz"
},
"kv_secret": {
"type": "string",
"defaultValue": "MCFAccessValue"
}
},
"annotations": [],
"typeProperties": {
"host": "@{linkedService().FileServerPath}",
"userId": "@{linkedService().user_name}",
"password": {
"type": "AzureKeyVaultSecret",
"store": {
"referenceName": "kv_asap",
"type": "LinkedServiceReference"
},
"secretName": {
"value": "@linkedService().kv_secret",
"type": "Expression"
}
}
},
"connectVia": {
"referenceName": "WSRB08968",
"type": "IntegrationRuntimeReference"
}
}
}