diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs
index f89055c6f..428d2ccca 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DbBindProvider/DbBindAccessory.cs
@@ -84,7 +84,10 @@ namespace SqlSugar
             {
                 keys.Add(dataReader.GetName(i));
                 var type = dataReader.GetFieldType(i);
-                sbTypes.Append(type.Name.Substring(0,2));
+                if (type != null)
+                {
+                    sbTypes.Append(type.Name.Substring(0, 2));
+                }
             }
             types = sbTypes.ToString();
             return keys;
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/ParameterInsertable.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/ParameterInsertable.cs
index 3aa141648..63416d738 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/ParameterInsertable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/ParameterInsertable.cs
@@ -149,7 +149,7 @@ namespace SqlSugar
             foreach (var gitem in groupList)
             {
                 batchInsetrSql.Append("(");
-                insertColumns = string.Join(",", gitem.Select(it => FormatValue(it.DbColumnName, it.Value, allParamter, itemable.InsertBuilder.Builder.SqlParameterKeyWord)));
+                insertColumns = string.Join(",", gitem.Select(it => FormatValue(it.PropertyType,it.DbColumnName, it.Value, allParamter, itemable.InsertBuilder.Builder.SqlParameterKeyWord)));
                 batchInsetrSql.Append(insertColumns);
                 if (groupList.Last() == gitem)
                 {
@@ -161,10 +161,11 @@ namespace SqlSugar
                 }
             }
         }
-        private string FormatValue(string name, object value, List<SugarParameter> allParamter, string keyword)
+        private string FormatValue(Type type,string name, object value, List<SugarParameter> allParamter, string keyword)
         {
             var result = keyword + name + allParamter.Count;
-            allParamter.Add(new SugarParameter(result, value));
+            var addParameter = new SugarParameter(result, value,type);
+            allParamter.Add(addParameter);
             return result;
         } 
         #endregion
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Dm/DbBind/DmDbBind.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Dm/DbBind/DmDbBind.cs
index 74ddc83b1..8589bd01e 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Dm/DbBind/DmDbBind.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/Dm/DbBind/DmDbBind.cs
@@ -107,6 +107,7 @@ namespace SqlSugar
                   new KeyValuePair<string, SqlSugar.CSharpDataType>("binary", CSharpDataType.@byteArray),
 
                   new KeyValuePair<string, CSharpDataType>("varchar",CSharpDataType.@string),
+                  new KeyValuePair<string, CSharpDataType>("nvarchar",CSharpDataType.@string),
                   new KeyValuePair<string, CSharpDataType>("varchar",CSharpDataType.@Guid),
                   new KeyValuePair<string, CSharpDataType>("varchar2",CSharpDataType.@string),
                   new KeyValuePair<string, CSharpDataType>("nvarchar2",CSharpDataType.@string),
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs
index 43ac21a94..a743ffb1a 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs
@@ -838,8 +838,8 @@ namespace SqlSugar
         #region IDispose
         public void Dispose()
         {
-            this.Context.Dispose();
             AllClientEach(it => it.Ado.RollbackTran());
+            AllClientEach(it => it.Dispose());
         }
 
         #endregion