SqlClient shrink SqlParameter and fix 34414

src/Common/src/System/Data/Common/AdapterUtil.cs

@@ -361,24 +361,33 @@ internal static Exception StreamClosed([CallerMemberName] string method = "")
 
         internal static string BuildQuotedString(string quotePrefix, string quoteSuffix, string unQuotedString)
         {
-            var resultString = new StringBuilder();
+            var resultString = new StringBuilder(unQuotedString.Length + quoteSuffix.Length + quoteSuffix.Length);
+            AppendQuotedString(resultString, quotePrefix, quoteSuffix, unQuotedString);
+            return resultString.ToString();
+        }
+
+        internal static string AppendQuotedString(StringBuilder buffer, string quotePrefix, string quoteSuffix, string unQuotedString)
+        {
+
             if (!string.IsNullOrEmpty(quotePrefix))
             {
-                resultString.Append(quotePrefix);
+                buffer.Append(quotePrefix);
             }
 
             // Assuming that the suffix is escaped by doubling it. i.e. foo"bar becomes "foo""bar".
             if (!string.IsNullOrEmpty(quoteSuffix))
             {
-                resultString.Append(unQuotedString.Replace(quoteSuffix, quoteSuffix + quoteSuffix));
-                resultString.Append(quoteSuffix);
+                int start = buffer.Length;
+                buffer.Append(unQuotedString);
+                buffer.Replace(quoteSuffix, quoteSuffix + quoteSuffix, start, unQuotedString.Length);
+                buffer.Append(quoteSuffix);
             }
             else
             {
-                resultString.Append(unQuotedString);
+                buffer.Append(unQuotedString);
             }
 
-            return resultString.ToString();
+            return buffer.ToString();
         }
 
         //

src/System.Data.SqlClient/src/System/Data/SqlClient/SqlCommand.cs

@@ -2222,6 +2222,13 @@ internal void DeriveParameters()
                         p.TypeName = r[colNames[(int)ProcParamsColIndex.TypeCatalogName]] + "." +
                             r[colNames[(int)ProcParamsColIndex.TypeSchemaName]] + "." +
                             r[colNames[(int)ProcParamsColIndex.TypeName]];
+
+                        // the constructed type name above is incorrectly formatted, it should be a 2 part name not 3
+                        // for compatibility we can't change this because the bug has existed for a long time and been 
+                        // worked around by users, so identify that it is present and catch it later in the execution
+                        // process once users can no longer interact with with the parameter type name
+                        p.IsDerivedParameterTypeName = true;
+
                     }
 
                     // XmlSchema name for Xml types
@@ -3321,6 +3328,23 @@ private void SetUpRPCParameters(_SqlRPC rpc, int startCount, bool inSchema, SqlP
                     // set default value bit
                     if (parameter.Direction != ParameterDirection.Output)
                     {
+                        // detect incorrectly derived type names unchanged by the caller and fix them
+                        if (parameter.IsDerivedParameterTypeName)
+                        {
+                            string[] parts = MultipartIdentifier.ParseMultipartIdentifier(parameter.TypeName, "[\"", "]\"", SR.SQL_TDSParserTableName, false);
+                            if (parts != null && parts.Length==4) // will always return int[4] right justified
+                            {
+                                if (
+                                    parts[3] != null && // name must not be null
+                                    parts[2] != null && // schema must not be null
+                                    parts[1] != null // server should not be null or we don't need to remove it
+                                )
+                                {
+                                    parameter.TypeName = QuoteIdentifier(parts.AsSpan(2,2));
+                                }
+                            }
+                        }
+
                         // remember that null == Convert.IsEmpty, DBNull.Value is a database null!
 
                         // Don't assume a default value exists for parameters in the case when
@@ -3665,9 +3689,14 @@ internal string BuildParamList(TdsParser parser, SqlParameterCollection paramete
 
         // Adds quotes to each part of a SQL identifier that may be multi-part, while leaving
         //  the result as a single composite name.
-        private string ParseAndQuoteIdentifier(string identifier, bool isUdtTypeName)
+        private static string ParseAndQuoteIdentifier(string identifier, bool isUdtTypeName)
         {
             string[] strings = SqlParameter.ParseTypeName(identifier, isUdtTypeName);
+            return QuoteIdentifier(strings);
+        }
+
+        private static string QuoteIdentifier(ReadOnlySpan<string> strings)
+        {
             StringBuilder bld = new StringBuilder();
 
             // Stitching back together is a little tricky. Assume we want to build a full multi-part name
@@ -3682,7 +3711,7 @@ private string ParseAndQuoteIdentifier(string identifier, bool isUdtTypeName)
                 }
                 if (null != strings[i] && 0 != strings[i].Length)
                 {
-                    bld.Append(ADP.BuildQuotedString("[", "]", strings[i]));
+                    ADP.AppendQuotedString(bld, "[", "]", strings[i]);
                 }
             }