C# Dynamics CRM: Lookup Contact ID using Full Name

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Find a contactid given a fullname.

Documentation: https://docs.microsoft.com/en-us/dynamics365/customer-engagement/web-api/contact?view=dynamics-ce-odata-9

CURL Command

curl -X GET https://my-dynamics-domain.api.crm.dynamics.com/api/data/v9.0/contacts
  -H "Accept: application/json" \
  -H "OData-MaxVersion: 4.0"  \
  -H "OData-Version: 4.0" \
  -d "$select=contactid" \
  -d "$filter=fullname eq 'Tomasz Bochenek'" \
  -H "Authorization: Bearer DYNAMICS_CRM_ACCESS_TOKEN"

C# Example

Chilkat.Rest rest = new Chilkat.Rest();
bool success;

//  URL: https://my-dynamics-domain.api.crm.dynamics.com/api/data/v9.0/contacts
bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
success = rest.Connect("my-dynamics-domain.api.crm.dynamics.com",port,bTls,bAutoReconnect);
if (success != true) {
    Debug.WriteLine("ConnectFailReason: " + Convert.ToString(rest.ConnectFailReason));
    Debug.WriteLine(rest.LastErrorText);
    return;
}

rest.AddQueryParam("$select","contactid");
rest.AddQueryParam("$filter","fullname eq 'Tomasz Bochenek'");

rest.AddHeader("OData-MaxVersion","4.0");
rest.AddHeader("Accept","application/json");
rest.AddHeader("OData-Version","4.0");
rest.AddHeader("Authorization","Bearer DYNAMICS_CRM_ACCESS_TOKEN");

Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
success = rest.FullRequestNoBodySb("GET","/api/data/v9.0/contacts",sbResponseBody);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

int respStatusCode = rest.ResponseStatusCode;
if (respStatusCode >= 400) {
    Debug.WriteLine("Response Status Code = " + Convert.ToString(respStatusCode));
    Debug.WriteLine("Response Header:");
    Debug.WriteLine(rest.ResponseHeader);
    Debug.WriteLine("Response Body:");
    Debug.WriteLine(sbResponseBody.GetAsString());
    return;
}

Chilkat.JsonObject jsonResponse = new Chilkat.JsonObject();
jsonResponse.LoadSb(sbResponseBody);

int i;
int count_i;

string odataContext = jsonResponse.StringOf("\"@odata.context\"");
i = 0;
count_i = jsonResponse.SizeOfArray("value");
while (i < count_i) {
    jsonResponse.I = i;
    string odataEtag = jsonResponse.StringOf("value[i].\"@odata.etag\"");
    string contactid = jsonResponse.StringOf("value[i].contactid");
    i = i + 1;
}

Sample JSON Response Body

{
  "@odata.context": "https://mydomain.api.crm.dynamics.com/api/data/v9.0/$metadata#contacts(contactid)",
  "value": [
    {
      "@odata.etag": "W/\"1162210\"",
      "contactid": "1fa1e5b9-88df-e311-b8e5-6c3be5a8b200"
    }
  ]
}