diff --git a/Bin/Debug/CommonControls/.NET4 示例/Itrycn_Project.exe b/Bin/Debug/CommonControls/.NET4 示例/Itrycn_Project.exe
index 9a81bdc..42e4a34 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/Itrycn_Project.exe and b/Bin/Debug/CommonControls/.NET4 示例/Itrycn_Project.exe differ
diff --git a/Bin/Debug/CommonControls/.NET4 示例/MyDb.dll b/Bin/Debug/CommonControls/.NET4 示例/MyDb.dll
index 32bcf66..36afc00 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/MyDb.dll and b/Bin/Debug/CommonControls/.NET4 示例/MyDb.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4 示例/MyDb_SQLite.dll b/Bin/Debug/CommonControls/.NET4 示例/MyDb_SQLite.dll
index 423fd38..ee53c04 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/MyDb_SQLite.dll and b/Bin/Debug/CommonControls/.NET4 示例/MyDb_SQLite.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4 示例/RyPrint.dll b/Bin/Debug/CommonControls/.NET4 示例/RyPrint.dll
index ff68b7c..d87a1e1 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/RyPrint.dll and b/Bin/Debug/CommonControls/.NET4 示例/RyPrint.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4 示例/RyWeb.dll b/Bin/Debug/CommonControls/.NET4 示例/RyWeb.dll
index 77ac91e..c52853d 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/RyWeb.dll and b/Bin/Debug/CommonControls/.NET4 示例/RyWeb.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4 示例/ryControls.dll b/Bin/Debug/CommonControls/.NET4 示例/ryControls.dll
index b6d8a1f..6f04428 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/ryControls.dll and b/Bin/Debug/CommonControls/.NET4 示例/ryControls.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4 示例/ryUpdate.dll b/Bin/Debug/CommonControls/.NET4 示例/ryUpdate.dll
index ba3dbfd..730d957 100644
Binary files a/Bin/Debug/CommonControls/.NET4 示例/ryUpdate.dll and b/Bin/Debug/CommonControls/.NET4 示例/ryUpdate.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/MyDb.dll b/Bin/Debug/CommonControls/.NET4/MyDb.dll
index 32bcf66..36afc00 100644
Binary files a/Bin/Debug/CommonControls/.NET4/MyDb.dll and b/Bin/Debug/CommonControls/.NET4/MyDb.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/MyDb_MSSQL.dll b/Bin/Debug/CommonControls/.NET4/MyDb_MSSQL.dll
index e4296eb..0caf7bc 100644
Binary files a/Bin/Debug/CommonControls/.NET4/MyDb_MSSQL.dll and b/Bin/Debug/CommonControls/.NET4/MyDb_MSSQL.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/MyDb_MySQL.dll b/Bin/Debug/CommonControls/.NET4/MyDb_MySQL.dll
index f81a391..1c3c923 100644
Binary files a/Bin/Debug/CommonControls/.NET4/MyDb_MySQL.dll and b/Bin/Debug/CommonControls/.NET4/MyDb_MySQL.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/MyDb_SQLite.dll b/Bin/Debug/CommonControls/.NET4/MyDb_SQLite.dll
index 423fd38..ee53c04 100644
Binary files a/Bin/Debug/CommonControls/.NET4/MyDb_SQLite.dll and b/Bin/Debug/CommonControls/.NET4/MyDb_SQLite.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/RyPrint.dll b/Bin/Debug/CommonControls/.NET4/RyPrint.dll
index ff68b7c..d87a1e1 100644
Binary files a/Bin/Debug/CommonControls/.NET4/RyPrint.dll and b/Bin/Debug/CommonControls/.NET4/RyPrint.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/RyWeb.dll b/Bin/Debug/CommonControls/.NET4/RyWeb.dll
index c52853d..0dce034 100644
Binary files a/Bin/Debug/CommonControls/.NET4/RyWeb.dll and b/Bin/Debug/CommonControls/.NET4/RyWeb.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/ryControls.dll b/Bin/Debug/CommonControls/.NET4/ryControls.dll
index b6d8a1f..6f04428 100644
Binary files a/Bin/Debug/CommonControls/.NET4/ryControls.dll and b/Bin/Debug/CommonControls/.NET4/ryControls.dll differ
diff --git a/Bin/Debug/CommonControls/.NET4/ryUpdate.dll b/Bin/Debug/CommonControls/.NET4/ryUpdate.dll
index ba3dbfd..730d957 100644
Binary files a/Bin/Debug/CommonControls/.NET4/ryUpdate.dll and b/Bin/Debug/CommonControls/.NET4/ryUpdate.dll differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/Itrycn_Project.exe b/Bin/Release/CommonControls/.NET4 示例/Itrycn_Project.exe
index c009282..76d7d91 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/Itrycn_Project.exe and b/Bin/Release/CommonControls/.NET4 示例/Itrycn_Project.exe differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/MyDb.dll b/Bin/Release/CommonControls/.NET4 示例/MyDb.dll
index f82a8dd..4d124eb 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/MyDb.dll and b/Bin/Release/CommonControls/.NET4 示例/MyDb.dll differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/MyDb.xml b/Bin/Release/CommonControls/.NET4 示例/MyDb.xml
index ef49181..1efd837 100644
--- a/Bin/Release/CommonControls/.NET4 示例/MyDb.xml	
+++ b/Bin/Release/CommonControls/.NET4 示例/MyDb.xml	
@@ -1421,6 +1421,14 @@
             <param name="list">要追加的内容列表，每一行为ip 域名的格式</param>
             <returns>0表示无需新增,-1表示添加失败,1表示追加成功</returns>
         </member>
+        <member name="M:ryCommon.Hosts.AddHosts(System.String,System.Boolean)">
+            <summary>
+            write为true,追加内容到hosts里;为false,判断是否需要追加
+            </summary>
+            <param name="list">要追加的内容列表，每一行为ip 域名的格式</param>
+            <param name="write">是否要写入,如果为false,则只判断是否需要追加,而不写入Hosts文件</param>
+            <returns>0表示无需新增,-1表示添加失败,1表示追加成功</returns>
+        </member>
         <member name="M:ryCommon.Hosts.AddHosts(ryCommon.HostInfo)">
             <summary>
             追加内容到hosts里
diff --git a/Bin/Release/CommonControls/.NET4 示例/MyDb_SQLite.dll b/Bin/Release/CommonControls/.NET4 示例/MyDb_SQLite.dll
index a3bbea4..b496768 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/MyDb_SQLite.dll and b/Bin/Release/CommonControls/.NET4 示例/MyDb_SQLite.dll differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/RyPrint.dll b/Bin/Release/CommonControls/.NET4 示例/RyPrint.dll
index 3af7986..2ac72d5 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/RyPrint.dll and b/Bin/Release/CommonControls/.NET4 示例/RyPrint.dll differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/RyWeb.dll b/Bin/Release/CommonControls/.NET4 示例/RyWeb.dll
index 77ac91e..c52853d 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/RyWeb.dll and b/Bin/Release/CommonControls/.NET4 示例/RyWeb.dll differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/ryControls.dll b/Bin/Release/CommonControls/.NET4 示例/ryControls.dll
index afc1a82..4dc7baf 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/ryControls.dll and b/Bin/Release/CommonControls/.NET4 示例/ryControls.dll differ
diff --git a/Bin/Release/CommonControls/.NET4 示例/ryUpdate.dll b/Bin/Release/CommonControls/.NET4 示例/ryUpdate.dll
index 5b80ddf..f3bf136 100644
Binary files a/Bin/Release/CommonControls/.NET4 示例/ryUpdate.dll and b/Bin/Release/CommonControls/.NET4 示例/ryUpdate.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/MyDb.dll b/Bin/Release/CommonControls/.NET4/MyDb.dll
index f82a8dd..4d124eb 100644
Binary files a/Bin/Release/CommonControls/.NET4/MyDb.dll and b/Bin/Release/CommonControls/.NET4/MyDb.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/MyDb.xml b/Bin/Release/CommonControls/.NET4/MyDb.xml
index ef49181..1efd837 100644
--- a/Bin/Release/CommonControls/.NET4/MyDb.xml
+++ b/Bin/Release/CommonControls/.NET4/MyDb.xml
@@ -1421,6 +1421,14 @@
             <param name="list">要追加的内容列表，每一行为ip 域名的格式</param>
             <returns>0表示无需新增,-1表示添加失败,1表示追加成功</returns>
         </member>
+        <member name="M:ryCommon.Hosts.AddHosts(System.String,System.Boolean)">
+            <summary>
+            write为true,追加内容到hosts里;为false,判断是否需要追加
+            </summary>
+            <param name="list">要追加的内容列表，每一行为ip 域名的格式</param>
+            <param name="write">是否要写入,如果为false,则只判断是否需要追加,而不写入Hosts文件</param>
+            <returns>0表示无需新增,-1表示添加失败,1表示追加成功</returns>
+        </member>
         <member name="M:ryCommon.Hosts.AddHosts(ryCommon.HostInfo)">
             <summary>
             追加内容到hosts里
diff --git a/Bin/Release/CommonControls/.NET4/MyDb_MSSQL.dll b/Bin/Release/CommonControls/.NET4/MyDb_MSSQL.dll
index af0a5c5..a713f9c 100644
Binary files a/Bin/Release/CommonControls/.NET4/MyDb_MSSQL.dll and b/Bin/Release/CommonControls/.NET4/MyDb_MSSQL.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/MyDb_MySQL.dll b/Bin/Release/CommonControls/.NET4/MyDb_MySQL.dll
index 222da3b..fa7ae82 100644
Binary files a/Bin/Release/CommonControls/.NET4/MyDb_MySQL.dll and b/Bin/Release/CommonControls/.NET4/MyDb_MySQL.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/MyDb_SQLite.dll b/Bin/Release/CommonControls/.NET4/MyDb_SQLite.dll
index a3bbea4..b496768 100644
Binary files a/Bin/Release/CommonControls/.NET4/MyDb_SQLite.dll and b/Bin/Release/CommonControls/.NET4/MyDb_SQLite.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/RyPrint.dll b/Bin/Release/CommonControls/.NET4/RyPrint.dll
index 3af7986..2ac72d5 100644
Binary files a/Bin/Release/CommonControls/.NET4/RyPrint.dll and b/Bin/Release/CommonControls/.NET4/RyPrint.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/RyWeb.dll b/Bin/Release/CommonControls/.NET4/RyWeb.dll
index 1afbd4e..4dc42b0 100644
Binary files a/Bin/Release/CommonControls/.NET4/RyWeb.dll and b/Bin/Release/CommonControls/.NET4/RyWeb.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/ryControls.dll b/Bin/Release/CommonControls/.NET4/ryControls.dll
index afc1a82..4dc7baf 100644
Binary files a/Bin/Release/CommonControls/.NET4/ryControls.dll and b/Bin/Release/CommonControls/.NET4/ryControls.dll differ
diff --git a/Bin/Release/CommonControls/.NET4/ryUpdate.dll b/Bin/Release/CommonControls/.NET4/ryUpdate.dll
index 5b80ddf..f3bf136 100644
Binary files a/Bin/Release/CommonControls/.NET4/ryUpdate.dll and b/Bin/Release/CommonControls/.NET4/ryUpdate.dll differ
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77c5cb9..0703c47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,14 @@
-### 2020-12-18更新
+### 2020-12-19 dev 更新
+------
+#### MyDb    V2.1.2012.1901
+- *.[新增]Hosts类AddHosts函数新增支持判断是否需要更新hosts文件(不写入)。
+
+### 2020-12-18 dev 更新
 ------
 #### ryControls    V2.1.2012.1801
 - *.[修复]修复RichTextBox2控件拖动滚动条，会导致界面变花的BUG。
 
-### 2020-12-10更新
+### 2020-12-10 dev 更新
 ------
 
 
diff --git a/Source/.vs/公用控件组V4/v16/.suo b/Source/.vs/公用控件组V4/v16/.suo
index 48a5fdf..f3a732e 100644
Binary files a/Source/.vs/公用控件组V4/v16/.suo and b/Source/.vs/公用控件组V4/v16/.suo differ
diff --git a/Source/MyDb/FileFuns/Hosts.cs b/Source/MyDb/FileFuns/Hosts.cs
index bde7d30..673196b 100644
--- a/Source/MyDb/FileFuns/Hosts.cs
+++ b/Source/MyDb/FileFuns/Hosts.cs
@@ -53,13 +53,23 @@ namespace ryCommon
             var hosts_path = ryCommon.RyFiles.GetRealPath("<sys>\\drivers\\etc\\hosts");
             var content = ryCommon.RyFiles.ReadAllText(hosts_path).Trim();
             return GetHosts(content);
-        }
+        }
         /// <summary>
         /// 追加内容到hosts里
         /// </summary>
         /// <param name="list">要追加的内容列表，每一行为ip 域名的格式</param>
+        /// <returns>0表示无需新增,-1表示添加失败,1表示追加成功</returns>
+        public static int AddHosts(string list)
+        {
+            return AddHosts(list,true);
+        }
+        /// <summary>
+        /// write为true,追加内容到hosts里;为false,判断是否需要追加
+        /// </summary>
+        /// <param name="list">要追加的内容列表，每一行为ip 域名的格式</param>
+        /// <param name="write">是否要写入,如果为false,则只判断是否需要追加,而不写入Hosts文件</param>
         /// <returns>0表示无需新增,-1表示添加失败,1表示追加成功</returns>
-        public static int AddHosts(string list)
+        public static int AddHosts(string list,bool write)
         {
             var hosts_path= ryCommon.RyFiles.GetRealPath("<sys>\\drivers\\etc\\hosts");
             var content = ryCommon.RyFiles.ReadAllText(hosts_path).Trim();
@@ -105,26 +115,29 @@ namespace ryCommon
             }
             if (isAdd)
             {
-                try
-                {
-                    content = "";
-                    for (int i = 0; i < from_list.Count; i++)
-                    {
-                        if (content.Length > 0) { content += "\r\n"; }
-                        if (from_list[i].Comment.Length > 0)
-                        {
-                            content += from_list[i].Comment;
-                        }
-                        else
-                        {
-                            content += from_list[i].IP + "\t" + from_list[i].Domain;
-                        }
-                    }
-                    ryCommon.RyFiles.WriteAllText(hosts_path, content, Encoding.UTF8);
-                }
-                catch
-                {
-                    return -1;
+                if (write)
+                {
+                    try
+                    {
+                        content = "";
+                        for (int i = 0; i < from_list.Count; i++)
+                        {
+                            if (content.Length > 0) { content += "\r\n"; }
+                            if (from_list[i].Comment.Length > 0)
+                            {
+                                content += from_list[i].Comment;
+                            }
+                            else
+                            {
+                                content += from_list[i].IP + "\t" + from_list[i].Domain;
+                            }
+                        }
+                        ryCommon.RyFiles.WriteAllText(hosts_path, content, Encoding.UTF8);
+                    }
+                    catch
+                    {
+                        return -1;
+                    }
                 }
             }
             else
diff --git a/Source/MyDb/Properties/AssemblyInfo.cs b/Source/MyDb/Properties/AssemblyInfo.cs
index 7d43107..b7f986d 100644
--- a/Source/MyDb/Properties/AssemblyInfo.cs
+++ b/Source/MyDb/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 //可以指定所有这些值，也可以使用“生成号”和“修订号”的默认值，
 // 方法是按如下所示使用“*”: :
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("2.1.2012.1001")]
-[assembly: AssemblyFileVersion("2.1.2012.1001")]
\ No newline at end of file
+[assembly: AssemblyVersion("2.1.2012.1901")]
+[assembly: AssemblyFileVersion("2.1.2012.1901")]
\ No newline at end of file
diff --git a/Source/MyDb/bin/x86/Debug/MyDb.dll b/Source/MyDb/bin/x86/Debug/MyDb.dll
index f733d64..fa36da6 100644
Binary files a/Source/MyDb/bin/x86/Debug/MyDb.dll and b/Source/MyDb/bin/x86/Debug/MyDb.dll differ
diff --git a/Source/MyDb/bin/x86/Release/MyDb.dll b/Source/MyDb/bin/x86/Release/MyDb.dll
index 48494f7..c4280b9 100644
Binary files a/Source/MyDb/bin/x86/Release/MyDb.dll and b/Source/MyDb/bin/x86/Release/MyDb.dll differ
diff --git a/Source/ryControls/bin/x86/Debug/MyDb.dll b/Source/ryControls/bin/x86/Debug/MyDb.dll
index f733d64..fa36da6 100644
Binary files a/Source/ryControls/bin/x86/Debug/MyDb.dll and b/Source/ryControls/bin/x86/Debug/MyDb.dll differ
diff --git a/Source/ryControls/bin/x86/Debug/ryControls.dll b/Source/ryControls/bin/x86/Debug/ryControls.dll
index a9f9189..9efa252 100644
Binary files a/Source/ryControls/bin/x86/Debug/ryControls.dll and b/Source/ryControls/bin/x86/Debug/ryControls.dll differ
diff --git a/Source/ryControls/bin/x86/Release/MyDb.dll b/Source/ryControls/bin/x86/Release/MyDb.dll
index 48494f7..c4280b9 100644
Binary files a/Source/ryControls/bin/x86/Release/MyDb.dll and b/Source/ryControls/bin/x86/Release/MyDb.dll differ
diff --git a/Source/ryControls/bin/x86/Release/ryControls.dll b/Source/ryControls/bin/x86/Release/ryControls.dll
index 2ecdcff..0d4d85e 100644
Binary files a/Source/ryControls/bin/x86/Release/ryControls.dll and b/Source/ryControls/bin/x86/Release/ryControls.dll differ