Struggling with Graphql syntax

[dhts]

I'm trying to write some vb.net code to call Graphql using httpclient (the postasync call).

This example works:

Dim body As String = "{""query"": ""{shop {name} }""}"

as does:

Dim body As String = "{""query"": ""{products(first: 3) {edges {node {id title} } } }""}"

but I'm struggling with the syntax for extending the set of products return to those which match a product_type, so this:

Dim body As String = "{""query"": ""{products(first: 3, query:""product_type:Fabric"") {edges {node {id title} } } }""}"

returns "Bad Request"

the string is being encoded as:

 Dim content = New StringContent(body, Encoding.UTF8, "application/json")

and called as:

Dim response = request.PostAsync(url, content).Result

Any pointers most welcome.

[Eric-HAN]

Dim body As String = "{""query"": ""{products(first: 3, query:""product_type:Fabric"") {edges {node {id title} } } }""}"   this word in red also shoud be quoted 

[Eric-HAN]

please ignore the reply. It is not right

[dhts · Accepted solution]

I eventually worked it out and posting here in case it helps someone in the future. The answer was to escape the double quotes in the middle query so this works:

Dim body As String = "{""query"": ""{products(first: 3, query:\""product_type:Fabric\"") {edges {node {id title} } } }""}"