Fixes #1682

Author: alexeyzimarev

src/RestSharp/Ensure.cs

@@ -22,7 +22,7 @@ public static string NotEmpty(string? value, string name)
         => string.IsNullOrWhiteSpace(value) ? throw new ArgumentNullException(name) : value!;
 
     public static string NotEmptyString(object? value, string name) {
-        var s = value as string;
+        var s = value as string ?? value?.ToString();
         return string.IsNullOrWhiteSpace(s) ? throw new ArgumentNullException(name) : s!;
     }
 }

src/RestSharp/Parameters/GetOrPostParameter.cs

@@ -16,5 +16,5 @@
 namespace RestSharp;
 
 public record GetOrPostParameter : NamedParameter {
-    public GetOrPostParameter(string name, object? value, bool encode = true) : base(name, value, ParameterType.GetOrPost, encode) { }
+    public GetOrPostParameter(string name, string? value, bool encode = true) : base(name, value, ParameterType.GetOrPost, encode) { }
 }

src/RestSharp/Parameters/HeaderParameter.cs

@@ -16,5 +16,5 @@
 namespace RestSharp;
 
 public record HeaderParameter : Parameter {
-    public HeaderParameter(string? name, object? value) : base(name, value, ParameterType.HttpHeader, false) { }
+    public HeaderParameter(string? name, string? value) : base(name, value, ParameterType.HttpHeader, false) { }
 }

src/RestSharp/Parameters/Parameter.cs

@@ -29,13 +29,13 @@ public abstract record Parameter(string? Name, object? Value, ParameterType Type
     /// <returns>String</returns>
     public override string ToString() => $"{Name}={Value}";
 
-    public static Parameter CreateParameter(string? name, object value, ParameterType type, bool encode = true)
+    public static Parameter CreateParameter(string? name, object? value, ParameterType type, bool encode = true)
         => type switch {
-            ParameterType.GetOrPost   => new GetOrPostParameter(name!, value, encode),
-            ParameterType.UrlSegment  => new UrlSegmentParameter(name!, value, encode),
-            ParameterType.HttpHeader  => new HeaderParameter(name, value),
-            ParameterType.RequestBody => new BodyParameter(name, value, Serializers.ContentType.Plain),
-            ParameterType.QueryString => new QueryParameter(name!, value, encode),
+            ParameterType.GetOrPost   => new GetOrPostParameter(name!, value?.ToString(), encode),
+            ParameterType.UrlSegment  => new UrlSegmentParameter(name!, value?.ToString()!, encode),
+            ParameterType.HttpHeader  => new HeaderParameter(name, value?.ToString()),
+            ParameterType.RequestBody => new BodyParameter(name, value!, Serializers.ContentType.Plain),
+            ParameterType.QueryString => new QueryParameter(name!, value?.ToString(), encode),
             _                         => throw new ArgumentOutOfRangeException(nameof(type), type, null)
         };
 }

src/RestSharp/Parameters/QueryParameter.cs

@@ -16,5 +16,5 @@
 namespace RestSharp;
 
 public record QueryParameter : NamedParameter {
-    public QueryParameter(string name, object? value, bool encode = true) : base(name, value, ParameterType.QueryString, encode) { }
+    public QueryParameter(string name, string? value, bool encode = true) : base(name, value, ParameterType.QueryString, encode) { }
 }

src/RestSharp/Parameters/UrlSegmentParameter.cs

@@ -16,6 +16,6 @@
 namespace RestSharp;
 
 public record UrlSegmentParameter : NamedParameter {
-    public UrlSegmentParameter(string name, object value, bool encode = true)
-        : base(name, Ensure.NotEmptyString(value, nameof(value)).Replace("%2F", "/").Replace("%2f", "/"), ParameterType.UrlSegment, encode) { }
+    public UrlSegmentParameter(string name, string value, bool encode = true)
+        : base(name, Ensure.NotEmpty(value, nameof(value)).Replace("%2F", "/").Replace("%2f", "/"), ParameterType.UrlSegment, encode) { }
 }

src/RestSharp/Request/RestRequestExtensions.cs

@@ -30,8 +30,8 @@ public static class RestRequestExtensions {
     /// <param name="value">Value of the parameter</param>
     /// <param name="encode">Encode the value or not, default true</param>
     /// <returns>This request</returns>
-    public static RestRequest AddParameter(this RestRequest request, string name, object value, bool encode = true)
-        => request.AddParameter(new GetOrPostParameter(name, value, encode));
+    public static RestRequest AddParameter(this RestRequest request, string name, object? value, bool encode = true)
+        => request.AddParameter(new GetOrPostParameter(name, value?.ToString(), encode));
 
     public static RestRequest AddParameter(this RestRequest request, string? name, object value, ParameterType type, bool encode = true)
         => request.AddParameter(Parameter.CreateParameter(name, value, type, encode));
@@ -52,8 +52,8 @@ public static RestRequest AddOrUpdateParameters(this RestRequest request, IEnume
         return request;
     }
 
-    public static RestRequest AddOrUpdateParameter(this RestRequest request, string name, object value)
-        => request.AddOrUpdateParameter(new GetOrPostParameter(name, value));
+    public static RestRequest AddOrUpdateParameter(this RestRequest request, string name, object? value)
+        => request.AddOrUpdateParameter(new GetOrPostParameter(name, value?.ToString()));
 
     public static RestRequest AddOrUpdateParameter(this RestRequest request, string name, object value, ParameterType type, bool encode = true)
         => request.AddOrUpdateParameter(Parameter.CreateParameter(name, value, type, encode));
@@ -94,9 +94,6 @@ public static RestRequest AddUrlSegment(this RestRequest request, string name, s
     public static RestRequest AddQueryParameter(this RestRequest request, string name, string value, bool encode = true)
         => request.AddParameter(new QueryParameter(name, value, encode));
 
-    public static RestRequest AddUrlSegment(this RestRequest request, string name, object value, bool encode = true)
-        => request.AddParameter(new UrlSegmentParameter(name, value, encode));
-
     /// <summary>
     /// Adds a file parameter to the request body. The file will be read from disk as a stream.
     /// </summary>

src/RestSharp/RestClientExtensions.Json.cs

@@ -48,7 +48,7 @@ public static partial class RestClientExtensions {
                 resource = resource.Replace(param, value.ToString());
             }
             else {
-                query.Add(new QueryParameter(name, value));
+                query.Add(new QueryParameter(name, value?.ToString()));
             }
         }
 

src/RestSharp/RestClientExtensions.Params.cs

@@ -24,7 +24,7 @@ public static partial class RestClientExtensions {
     /// <param name="name">Name of the parameter</param>
     /// <param name="value">Value of the parameter</param>
     /// <returns>This request</returns>
-    public static RestClient AddDefaultParameter(this RestClient client, string name, object value)
+    public static RestClient AddDefaultParameter(this RestClient client, string name, string value)
         => client.AddDefaultParameter(new GetOrPostParameter(name, value));
 
     /// <summary>

test/RestSharp.IntegrationTests/AsyncTests.cs

@@ -37,7 +37,7 @@ public async Task Can_Perform_ExecuteGetAsync_With_Response_Type() {
         var request  = new RestRequest("success");
         var response = await _client.ExecuteAsync<Response>(request);
 
-        response.StatusCode.Should().Be(200);
+        response.StatusCode.Should().Be(HttpStatusCode.OK);
         response.Data!.Message.Should().Be("Works!");
     }