减少 AddForm(string? encodedForm)的分配

Author: xljiulang

WebApiClientCore/HttpContents/FormContent.cs

@@ -111,15 +111,18 @@ public void AddFormField(IEnumerable<KeyValue> keyValues)
         /// 添加已编码的原始内容表单
         /// </summary>
         /// <param name="encodedForm">表单内容</param>
-        public void AddForm(string? encodedForm)
+        public void AddForm(ReadOnlySpan<char> encodedForm)
         {
-            if (encodedForm == null)
+            this.EnsureNotBuffered();
+
+            if (encodedForm.Length > 0)
             {
-                return;
+                if (this.bufferWriter.WrittenCount > 0)
+                {
+                    this.bufferWriter.Write((byte)'&');
+                }
+                httpEncoding.GetBytes(encodedForm, this.bufferWriter);
             }
-
-            var formBytes = httpEncoding.GetBytes(encodedForm);
-            this.AddForm(formBytes);
         }
 
         /// <summary>
@@ -130,16 +133,14 @@ public void AddForm(ReadOnlySpan<byte> encodedForm)
         {
             this.EnsureNotBuffered();
 
-            if (encodedForm.IsEmpty == true)
+            if (encodedForm.Length > 0)
             {
-                return;
-            }
-
-            if (this.bufferWriter.WrittenCount > 0)
-            {
-                this.bufferWriter.Write((byte)'&');
+                if (this.bufferWriter.WrittenCount > 0)
+                {
+                    this.bufferWriter.Write((byte)'&');
+                }
+                this.bufferWriter.Write(encodedForm);
             }
-            this.bufferWriter.Write(encodedForm);
         }
 
         /// <summary>