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10 changes: 6 additions & 4 deletions Refit/RequestBuilderImplementation.cs
Original file line number Diff line number Diff line change
Expand Up @@ -646,7 +646,7 @@ bool paramsContainsCancellationToken
ret.Content = multiPartContent;
}

var queryParamsToAdd = new List<KeyValuePair<string, string?>>();
List<KeyValuePair<string, string?>>? queryParamsToAdd = null;
var headersToAdd = restMethod.Headers.Count > 0 ?
new Dictionary<string, string?>(restMethod.Headers)
: null;
Expand Down Expand Up @@ -737,6 +737,7 @@ bool paramsContainsCancellationToken
|| queryAttribute != null
)
{
queryParamsToAdd ??= [];
AddQueryParameters(restMethod, queryAttribute, param, queryParamsToAdd, i, parameterInfo);
continue;
}
Expand All @@ -756,9 +757,9 @@ bool paramsContainsCancellationToken
var urlTarget = BuildRelativePath(basePath, restMethod, paramList);

var uri = new UriBuilder(new Uri(BaseUri, urlTarget));
ParseExistingQueryString(uri, queryParamsToAdd);
ParseExistingQueryString(uri, ref queryParamsToAdd);

if (queryParamsToAdd.Count != 0)
if (queryParamsToAdd is not null && queryParamsToAdd.Count != 0)
{
uri.Query = CreateQueryString(queryParamsToAdd);;
}
Expand Down Expand Up @@ -1172,11 +1173,12 @@ var value in ParseEnumerableQueryParameterValue(
}
}

static void ParseExistingQueryString(UriBuilder uri, List<KeyValuePair<string, string?>> queryParamsToAdd)
static void ParseExistingQueryString(UriBuilder uri, ref List<KeyValuePair<string, string?>>? queryParamsToAdd)
{
if (string.IsNullOrEmpty(uri.Query))
return;

queryParamsToAdd ??= [];
var query = HttpUtility.ParseQueryString(uri.Query);
var index = 0;
foreach (var key in query.AllKeys)
Expand Down