Combine AsSpan().Slice(...) calls into AsSpan(...)

src/libraries/Common/src/System/Net/MultiArrayBuffer.cs

@@ -200,16 +200,16 @@ public void GrowAvailableSpace(int byteCount)
                         }
 
                         byte[]?[] newBlockArray = new byte[]?[blockArraySize];
-                        _blocks.AsSpan().Slice((int)unusedInitialBlocks, (int)usedBlocks).CopyTo(newBlockArray);
+                        _blocks.AsSpan((int)unusedInitialBlocks, (int)usedBlocks).CopyTo(newBlockArray);
                         _blocks = newBlockArray;
                     }
                     else
                     {
                         // We can shift the array down to make enough space
-                        _blocks.AsSpan().Slice((int)unusedInitialBlocks, (int)usedBlocks).CopyTo(_blocks);
+                        _blocks.AsSpan((int)unusedInitialBlocks, (int)usedBlocks).CopyTo(_blocks);
 
                         // Null out the part of the array left over from the shift, so that we aren't holding references to those blocks.
-                        _blocks.AsSpan().Slice((int)usedBlocks, (int)unusedInitialBlocks).Clear();
+                        _blocks.AsSpan((int)usedBlocks, (int)unusedInitialBlocks).Clear();
                     }
 
                     uint shift = unusedInitialBlocks * BlockSize;

src/libraries/Common/tests/StreamConformanceTests/System/IO/StreamConformanceTests.cs

@@ -3007,7 +3007,7 @@ public virtual async Task ZeroByteRead_PerformsZeroByteReadOnUnderlyingStreamWhe
 
                 if (FlushGuaranteesAllDataWritten)
                 {
-                    AssertExtensions.SequenceEqual(data, buffer.AsSpan().Slice(0, bytesRead));
+                    AssertExtensions.SequenceEqual(data, buffer.AsSpan(0, bytesRead));
                 }
             }
         }

src/libraries/System.Data.Odbc/src/System/Data/Odbc/OdbcHandle.cs

@@ -188,7 +188,7 @@ internal ODBC32.SQLRETURN GetDiagnosticField(out string sqlState)
             ODBC.TraceODBC(3, "SQLGetDiagFieldW", retcode);
             if ((retcode == ODBC32.SQLRETURN.SUCCESS) || (retcode == ODBC32.SQLRETURN.SUCCESS_WITH_INFO))
             {
-                sqlState = new string(buffer.AsSpan().Slice(0, buffer.AsSpan().IndexOf('\0')));
+                sqlState = new string(buffer.AsSpan(0, buffer.AsSpan().IndexOf('\0')));
             }
             else
             {
@@ -208,13 +208,13 @@ internal ODBC32.SQLRETURN GetDiagnosticRecord(short record, out string sqlState,
 
             if ((retcode == ODBC32.SQLRETURN.SUCCESS) || (retcode == ODBC32.SQLRETURN.SUCCESS_WITH_INFO))
             {
-                sqlState = new string(buffer.AsSpan().Slice(0, buffer.AsSpan().IndexOf('\0')));
+                sqlState = new string(buffer.AsSpan(0, buffer.AsSpan().IndexOf('\0')));
             }
             else
             {
                 sqlState = string.Empty;
             }
-            messageBuilder.Append(new string(message.AsSpan().Slice(0, message.AsSpan().IndexOf('\0'))));
+            messageBuilder.Append(new string(message.AsSpan(0, message.AsSpan().IndexOf('\0'))));
             return retcode;
         }
     }

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Instrument.netcore.cs

@@ -104,7 +104,7 @@ protected void RecordMeasurement(T measurement, in TagList tagList)
             KeyValuePair<string, object?>[]? tags = tagList.Tags;
             if (tags is not null)
             {
-                RecordMeasurement(measurement, tags.AsSpan().Slice(0, tagList.Count));
+                RecordMeasurement(measurement, tags.AsSpan(0, tagList.Count));
                 return;
             }
 

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Instrument.netfx.cs

@@ -32,7 +32,7 @@ protected void RecordMeasurement(T measurement, KeyValuePair<string, object?> ta
             var tags = ts_tags ?? new KeyValuePair<string, object?>[MaxTagsCount];
             ts_tags = null;
             tags[0] = tag;
-            RecordMeasurement(measurement, tags.AsSpan().Slice(0, 1));
+            RecordMeasurement(measurement, tags.AsSpan(0, 1));
             ts_tags = tags;
         }
 
@@ -48,7 +48,7 @@ protected void RecordMeasurement(T measurement, KeyValuePair<string, object?> ta
             ts_tags = null;
             tags[0] = tag1;
             tags[1] = tag2;
-            RecordMeasurement(measurement, tags.AsSpan().Slice(0, 2));
+            RecordMeasurement(measurement, tags.AsSpan(0, 2));
             ts_tags = tags;
         }
 
@@ -66,7 +66,7 @@ protected void RecordMeasurement(T measurement, KeyValuePair<string, object?> ta
             tags[0] = tag1;
             tags[1] = tag2;
             tags[2] = tag3;
-            RecordMeasurement(measurement, tags.AsSpan().Slice(0, 3));
+            RecordMeasurement(measurement, tags.AsSpan(0, 3));
             ts_tags = tags;
         }
 
@@ -80,7 +80,7 @@ protected void RecordMeasurement(T measurement, in TagList tagList)
             KeyValuePair<string, object?>[]? tags = tagList.Tags;
             if (tags is not null)
             {
-                RecordMeasurement(measurement, tags.AsSpan().Slice(0, tagList.Count));
+                RecordMeasurement(measurement, tags.AsSpan(0, tagList.Count));
                 return;
             }
 
@@ -104,7 +104,7 @@ protected void RecordMeasurement(T measurement, in TagList tagList)
 
             ts_tags = null;
 
-            RecordMeasurement(measurement, tags.AsSpan().Slice(0, tagList.Count));
+            RecordMeasurement(measurement, tags.AsSpan(0, tagList.Count));
 
             ts_tags = tags;
         }

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/TagList.cs

@@ -234,7 +234,7 @@ public readonly void CopyTo(Span<KeyValuePair<string, object?>> tags)
 
             if (_overflowTags is not null)
             {
-                _overflowTags.AsSpan().Slice(0, _tagsCount).CopyTo(tags);
+                _overflowTags.AsSpan(0, _tagsCount).CopyTo(tags);
                 return;
             }
 
@@ -273,7 +273,7 @@ public readonly void CopyTo(KeyValuePair<string, object?>[] array, int arrayInde
                 throw new ArgumentOutOfRangeException(nameof(arrayIndex));
             }
 
-            CopyTo(array.AsSpan().Slice(arrayIndex));
+            CopyTo(array.AsSpan(arrayIndex));
         }
 
         /// <summary>

src/libraries/System.Formats.Cbor/src/System/Formats/Cbor/CborHelpers.netstandard.cs

@@ -99,7 +99,7 @@ public static BigInteger CreateBigIntegerFromUnsignedBigEndianBytes(byte[] bigEn
                 // you can add a zero-byte value to the most significant side of the array.
                 // Right in this case as it is Big-endian.
                 var bytesPlusOne = new byte[bigEndianBytes.Length + 1];
-                bigEndianBytes.CopyTo(bytesPlusOne.AsSpan().Slice(1));
+                bigEndianBytes.CopyTo(bytesPlusOne.AsSpan(1));
                 temp = bytesPlusOne;
             }
             else

src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamNetworkStreamTest.cs

@@ -1030,7 +1030,7 @@ public async Task SslStream_RandomSizeWrites_OK(int bufferSize, int readBufferSi
                     }
 
                     Assert.Equal(bufferSize, totalLength);
-                    AssertExtensions.SequenceEqual(dataToCopy.AsSpan(), dataReceived.AsSpan().Slice(0, totalLength));
+                    AssertExtensions.SequenceEqual(dataToCopy.AsSpan(), dataReceived.AsSpan(0, totalLength));
                 });
 
                 await TestConfiguration.WhenAllOrAnyFailedWithTimeout(writer, reader);

src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.cs

@@ -583,7 +583,7 @@ public void AcceptAsync_WithReceiveBuffer_Success()
 
                 Assert.Equal(acceptBufferDataSize, acceptArgs.BytesTransferred);
 
-                AssertExtensions.SequenceEqual(sendBuffer, acceptArgs.Buffer.AsSpan().Slice(0, acceptArgs.BytesTransferred));
+                AssertExtensions.SequenceEqual(sendBuffer, acceptArgs.Buffer.AsSpan(0, acceptArgs.BytesTransferred));
             }
         }
 

src/libraries/System.Private.CoreLib/src/System/Globalization/Ordinal.cs

@@ -326,7 +326,7 @@ internal static unsafe int LastIndexOf(string source, string value, int startInd
 
             if (GlobalizationMode.Invariant)
             {
-                return ignoreCase ? InvariantModeCasing.LastIndexOfIgnoreCase(source.AsSpan().Slice(startIndex, count), value) : LastIndexOf(source, value, startIndex, count);
+                return ignoreCase ? InvariantModeCasing.LastIndexOfIgnoreCase(source.AsSpan(startIndex, count), value) : LastIndexOf(source, value, startIndex, count);
             }
 
             if (GlobalizationMode.UseNls)

src/libraries/System.Security.Cryptography/src/System/Security/Cryptography/CapiHelper.Windows.cs

@@ -98,7 +98,7 @@ internal static string GetDefaultProvider(int dwType)
             }
 
             // check to see if there are upgrades available for the requested CSP
-            string providerNameString = new string(providerName.AsSpan().Slice(0, providerName.AsSpan().IndexOf('\0')));
+            string providerNameString = new string(providerName.AsSpan(0, providerName.AsSpan().IndexOf('\0')));
             string? wszUpgrade = null;
             if (dwType == (int)ProviderType.PROV_RSA_FULL)
             {

src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Utf8JsonReaderTests.TryGet.cs

@@ -1224,7 +1224,7 @@ void Test(ref Utf8JsonReader reader)
                 byte[] buffer = new byte[expectedUtf8Size];
                 for (int i = 0; i < expectedUtf8Size; i++)
                 {
-                    JsonTestHelper.AssertThrows<ArgumentException>(ref reader, (ref Utf8JsonReader reader) => reader.CopyString(buffer.AsSpan().Slice(0, i)));
+                    JsonTestHelper.AssertThrows<ArgumentException>(ref reader, (ref Utf8JsonReader reader) => reader.CopyString(buffer.AsSpan(0, i)));
                     Assert.All(buffer, static b => Assert.Equal(0, b));
                 }
 
@@ -1249,7 +1249,7 @@ void Test(ref Utf8JsonReader reader)
                 char[] buffer = new char[expectedSize];
                 for (int i = 0; i < expectedSize; i++)
                 {
-                    JsonTestHelper.AssertThrows<ArgumentException>(ref reader, (ref Utf8JsonReader reader) => reader.CopyString(buffer.AsSpan().Slice(0, i)));
+                    JsonTestHelper.AssertThrows<ArgumentException>(ref reader, (ref Utf8JsonReader reader) => reader.CopyString(buffer.AsSpan(0, i)));
                     Assert.All(buffer, static c => Assert.Equal(0, c));
                 }