fix bug

src/csharp/Grpc.Core.Tests/Internal/MetadataArraySafeHandleTest.cs

@@ -59,5 +59,26 @@ namespace Grpc.Core.Internal.Tests
             var nativeMetadata = MetadataArraySafeHandle.Create(metadata);
             nativeMetadata.Dispose();
         }
+
+        [Test]
+        public void ReadMetadataFromPtrUnsafe()
+        {
+            var metadata = new Metadata
+            {
+                new Metadata.Entry("host", "somehost"),
+                new Metadata.Entry("header2", "header value"),
+            };
+            var nativeMetadata = MetadataArraySafeHandle.Create(metadata);
+
+            var copy = MetadataArraySafeHandle.ReadMetadataFromPtrUnsafe(nativeMetadata.Handle);
+            Assert.AreEqual(2, copy.Count);
+
+            Assert.AreEqual("host", copy[0].Key);
+            Assert.AreEqual("somehost", copy[0].Value);
+            Assert.AreEqual("header2", copy[1].Key);
+            Assert.AreEqual("header value", copy[1].Value);
+
+            nativeMetadata.Dispose();
+        }
     }
 }

src/csharp/ext/grpc_csharp_ext.c

@@ -172,10 +172,10 @@ grpcsharp_metadata_array_count(grpc_metadata_array *array) {
   return (gpr_intptr) array->count;
 }
 
-GPR_EXPORT const grpc_metadata *GPR_CALLTYPE
+GPR_EXPORT grpc_metadata GPR_CALLTYPE
 grpcsharp_metadata_array_get(grpc_metadata_array *array, size_t index) {
   GPR_ASSERT(index < array->count);
-  return &(array->metadata[index]);
+  return array->metadata[index];
 }
 
 /* Move contents of metadata array */