\u3044\u308f\u3086\u308b\u300c\u25cb\u3064\u306e\u65b9\u6cd5\u300d\u3068\u3044\u3046\u91e3\u308a\u30bf\u30a4\u30c8\u30eb\u3067\u3059\u304c\u3001\u30ef\u30bf\u30af\u30b7\u7684\u306b\u306f\u4f8b\u5916\u51e6\u7406\u306b\u95a2\u3057\u3066\u306f\u4e00\u629e\u3067\u3059\u3002
\n\u4f8b\u5916\u51e6\u7406\u306b\u3064\u3044\u3066\u306f\u3001\u65b9\u6cd5\u8ad6\u7684\u306b\u3082\u8272\u3005\u3042\u308b\u306e\u306f\u5206\u304b\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u300c\u696d\u52d9\u300d\u3068\u3044\u3046\u7bc4\u56f2\u3067\u8003\u3048\u308b\u3068\u3001\u3068\u3044\u3046\u9078\u629e\u3067\u3059\u3002<\/p>\n
UI\u304c\u3042\u308b\u5834\u5408\u3068\u306a\u3044\u5834\u5408\u3067\u3001\u3061\u3087\u3063\u3068\u3060\u3051\u66f8\u304d\u65b9\u304c\u5206\u304b\u308c\u307e\u3059\u3002<\/p>\n
\r\n\/\/ UI\u306e\u3042\u308b\u5834\u5408\r\nint func(...) {\r\n try {\r\n \/\/ \u5168\u3066\u306e\u51e6\u7406\r\n } catch ( Exception ex ) {\r\n \/\/ \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\r\n MessageBox.Show( ... );\r\n }\r\n}\r\n<\/pre>\n\r\n\/\/ UI\u306e\u306a\u3044\u5834\u5408\r\nint func(...) {\r\n try {\r\n \/\/ \u5168\u3066\u306e\u51e6\u7406\r\n } catch ( Exception ex ) {\r\n \/\/ \u305d\u306e\u307e\u307e\u4f8b\u5916\u3092\u8fd4\u3059\r\n throw ;\r\n }\r\n}\r\n<\/pre>\n\u3053\u3093\u306a\u98a8\u306b\u3001\u95a2\u6570\/\u30e1\u30bd\u30c3\u30c9\u5185\u306e\u51e6\u7406\u3092\u3010\u5168\u3066\u3011try catch \u3067\u56f2\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002
\n\u4e71\u66b4\u3067\u3059\u3088\u306d…\u3067\u3059\u304c\u3001\u3053\u306e\u65b9\u6cd5\u3063\u3066 VB3.0 \u306e\u9803\u304b\u3089\u306e\u9244\u677f\u306a\u65b9\u6cd5\u3060\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n
\r\nsub func(...) \r\nON ERROR GOTO L_ERROR\r\n\r\n ' \u5185\u90e8\u306e\u3059\u3079\u3066\u306e\u51e6\u7406\r\n\r\n exit sub\r\nL_ERROR:\r\n ' \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\r\n MsgBox(...)\r\nend sub\r\n<\/pre>\n\u306e\u3088\u3046\u306b\u3001VB \u306e\u9803(.NET\u3067\u306f\u306a\u3044)\u306f\u3001ON ERROR GOTO \u3092\u4f7f\u3063\u3066\u3044\u307e\u3057\u305f\u3002
\n\u3055\u3066\u3001\u3053\u306e\u9803 C++ \u306f\u3069\u3046\u3060\u3063\u305f\u304b\u3068\u3044\u3046\u3068…\u5b9f\u306f C++ \u306f\u4f59\u308a\u6d41\u884c\u3063\u3066\u306f\u3044\u306a\u304f\u3066\u3001\u3044\u307e\u3060 C \u8a00\u8a9e\u304c\u4e3b\u6d41\u3067\u3057\u305f\u3002\u306a\u306e\u3067 C \u8a00\u8a9e\u306e\u5834\u5408\u306f\u3001<\/p>\n
\r\nvoid func( ... ) \r\n{\r\n\tint err ;\r\n\t\r\n\terr = subfunc( ... );\r\n\tif ( err != 0 ) {\r\n\t\t\/\/ \u30a8\u30e9\u30fc\u51e6\u7406\r\n\t}\r\n}\r\n<\/pre>\n\u306a\u98a8\u306b\u3001\u623b\u308a\u5024\u3067\u30a8\u30e9\u30fc\u3092\u5224\u5225\u3059\u308b\u3057\u304b\u306a\u304b\u3063\u305f\u306e\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u9244\u677f\u306e\u4f8b\u5916\u51e6\u7406\u3067\u30ed\u30b0\u30a4\u30f3\u51e6\u7406\u3092\u66f8\u3044\u3066\u307f\u308b\u3068\u3001<\/p>\n
\r\nclass Principal {\r\n string _username ;\r\n \r\n public bool Logon( string username, string password ) {\r\n try {\r\n if ( username == "" ) \r\n throw new Exception("\u30e6\u30fc\u30b6\u30fc\u540d\u304c\u7a7a\u767d");\r\n if ( password == "" ) \r\n throw new Exception("\u30d1\u30b9\u30ef\u30fc\u30c9\u304c\u7a7a\u767d");\r\n if ( username == "root" ) \r\n throw new Exception("root\u30e6\u30fc\u30b6\u30fc\u306f\u30ed\u30b0\u30a4\u30f3\u3067\u304d\u306a\u3044");\r\n \r\n SqlConnection cn = new SqlConnection(...);\r\n SqlCommand cmd = new SqlCommand( cn, \r\n @"SELECT count(*) from usres \r\n where @username = username and @password = password" );\r\n cmd.Parameters.Add(new SqlParameter("@username", username ));\r\n cmd.Parameters.Add(new SqlParameter("@password2, password ));\r\n cn.Open();\r\n int cnt =(int)cmd.ExecuteScaler();\r\n cn.Close();\r\n if ( cnt == 0 ) \r\n throw new Exception("\u30ed\u30b0\u30a4\u30f3\u3067\u304d\u306a\u3044");\r\n \r\n \/\/ \u30e6\u30fc\u30b6\u30fc\u540d\u3092\u4fdd\u6301\u3057\u3066\u6b63\u5e38\u7d42\u4e86\r\n this._username = username ;\r\n return true;\r\n } catch ( Exception ex )\r\n throw ;\r\n }\r\n }\r\n} \r\n<\/pre>\n\u306a\u306b\u3084\u3089\u5996\u3057\u3052\u306a\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u304c\uff08\u82e6\u7b11\uff09\u3001\u696d\u52d9\u30b3\u30fc\u30c9\u306e\u5834\u5408\u306f\u3053\u3063\u3061\u306e\u307b\u3046\u304c\u3059\u3093\u306a\u308a\u901a\u308b\u3057\u9811\u5065\u306a\u306e\u3067\u3059\u3002<\/p>\n
\u5b9f\u306f\u3001\u3053\u306e\u30b3\u30fc\u30c9\u4f8b\u5916\u306e throw \u304c\u5927\u91cf\u306b\u66f8\u3044\u3066\u3042\u308b\u306e\u3067\u5b89\u5168\u306a\u30b3\u30fc\u30c9\u3068\u306f\u7a0b\u9060\u3044\u3088\u3046\u306a\u6c17\u3082\u3057\u307e\u3059\u304c\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u3057\u3066\u306e\u4f7f\u3044\u65b9\u3067\u306f\u306a\u304f\u3066\u696d\u52d9\u30b3\u30fc\u30c9\u3092\u3053\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u3057\u3066\u3044\u307e\u3046\u3068\u3001exception \u306e catch \u304c\u5fc5\u9808\u306b\u306a\u308b\u306e\u3067\u3001\u3053\u308c\u306f\u3053\u308c\u3067\u5b89\u5168\u306a\u306e\u3067\u3059\u3002<\/p>\n
\u30d5\u30a7\u30a4\u30eb\u30bb\u30fc\u30d5\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u306b\u306f\uff1f | Moonmile Solutions Blog
\nhttp:\/\/www.moonmile.net\/blog\/archives\/2173<\/a><\/p>\n\u3055\u3066\u3001\u3053\u306e\u696d\u52d9\u30b3\u30fc\u30c9\u3092\u5229\u7528\u3059\u308b\u5074\u3082 try catch \u3092\u591a\u7528\u3057\u307e\u3059\u3002<\/p>\n
\r\n\/\/\/ \u30ed\u30b0\u30a4\u30f3\u30dc\u30bf\u30f3\u306e\u30af\u30ea\u30c3\u30af\r\nprotected void Login_OnClick(...)\r\n{\r\n\ttry {\r\n\t\tPrincipal user = new Principal();\r\n\t\tstring username = TextUserName.Text ;\r\n\t\tstring password = TextPassword.Text ;\r\n\t\t\/\/ username, password \u306e\u30c1\u30a7\u30c3\u30af\u306f\u4e00\u5207\u3057\u306a\u3044\u3002\r\n\t\tuser.Logon( username, password );\r\n\t\t\/\/ \u6210\u529f\u6642\u306b\u30d5\u30a9\u30fc\u30e0\u306b\u30e6\u30fc\u30b6\u30fc\u6a29\u9650\u3092\u4fdd\u6301\u3059\u308b\r\n\t\tthis.User = user ;\r\n\t} catch {\r\n\t\t\/\/ \u4f8b\u5916\u767a\u751f\u306f\u3001\u4e00\u5f8b\u300c\u30ed\u30b0\u30a4\u30f3\u3067\u304d\u306a\u3044\u300d\u3068\u3059\u308b\u3002\r\n\t\tMessageBox.Show("\u30ed\u30b0\u30a4\u30f3\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f");\r\n\t}\r\n}\r\n<\/pre>\n\u3053\u3046\u3044\u3046\u66f8\u304d\u65b9\u3092\u4e00\u5f8b\u3059\u308b\u3068\u300c\u6b63\u5e38\u7cfb\u300d\u3092\u4e00\u6c17\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u3053\u306e\u767a\u60f3\u306e\u30d9\u30fc\u30b9\u306f\u3001VB3.0 \u306e\u9803\u304b\u3089\u3042\u308b ON ERROR GOTO \u306a\u3093\u3067\u3059\u3051\u3069\u306d\u3002<\/p>\n
\u3053\u3093\u306a\u98a8\u306a\u4f8b\u5916\u51e6\u7406\u3092\u53d6\u308b\u5834\u5408\u3001\u3044\u304f\u3064\u304b\u306e\u524d\u63d0\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30fb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u304c\u57fa\u672c\u3001\u6b63\u5e38\u306b\u884c\u308f\u308c\u308b\u3053\u3068\u3002
\n\u30fb\u51e6\u7406\u306e\u6d41\u308c\u304c\u57fa\u672c\u3001\u6b63\u5e38\u7cfb\u3067\u6d41\u308c\u308b\u3053\u3068\u3002
\n\u30fb\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d0\u30b0\u306f\u3001\u57fa\u672c\u7686\u7121\u3067\u3042\u308b\u3053\u3068\uff08\u5b9f\u884c\u6642\u306b\u30c7\u30d0\u30c3\u30b0\u30ed\u30b0\u7b49\u3092\u53d6\u3089\u306a\u3044\uff09\u3002
\n\u30fb\u30e6\u30fc\u30b6\u30fc\u3078\u306f\u57fa\u672c\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\u3092\u77e5\u3089\u305b\u306a\u3044\u3053\u3068\u3002<\/p>\n
\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u66f8\u304d\u65b9\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6f5c\u5728\u30d0\u30b0\u3092\u96a0\u3057\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308b\u306e\u3067\u3059\u3002\u3067\u3059\u304c\u3001\u30ef\u30bf\u30af\u30b7\u7684\u306b\u306f\u300c\u30ea\u30ea\u30fc\u30b9\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u76ee\u306e\u524d\u3067\u843d\u3061\u306a\u3044\u3053\u3068\u304c\u6700\u512a\u5148\u3067\u306f\u306a\u304b\u308d\u3046\u304b\uff1f\u300d\u3068\u8003\u3048\u308b\u8a33\u3067\u3067\u3001\u7a81\u5982\u3068\u3057\u3066\u843d\u3061\u306a\u3044\u3053\u3068\u3092\u6700\u512a\u5148\u306b\u3059\u308b\uff08\u305d\u308c\u304c\u6f5c\u5728\u30d0\u30b0\u3092\u96a0\u3059\u3082\u306e\u3067\u3042\u3063\u305f\u3068\u3057\u3066\u3082\uff09\u3068\u3001\u3053\u3046\u3044\u3046\u4f8b\u5916\u51e6\u7406\u306e\u4f7f\u3044\u65b9\u3082\u3042\u308a\u304b\u306a\u3041\u3068\u8003\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3061\u306a\u307f\u306b\u3001\u305d\u3053\u305d\u3053\u306e\u696d\u52d9\u4ee5\u5916\u3067\u306f\u3001\u3053\u3046\u3044\u3046\u66f8\u304d\u65b9\u3092\u3057\u307e\u305b\u3093\u3002\u30a2\u30ea\u3060\u3068\u306f\u601d\u3046\u306e\u3067\u3059\u304c\u3001\u696d\u52d9\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3068\u304d\u306b\u9650\u3063\u3066\u3068\u3044\u3046\u8a71\u3067\u3059\u3002\u624b\u5143\u306e\u30c4\u30fc\u30eb\u3092\u4f5c\u308b\u3068\u304d\u306a\u3093\u304b\u306f DEBUG \u5b9a\u7fa9\u306a\u3069\u3092\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u3044\u308f\u3086\u308b\u300c\u25cb\u3064\u306e\u65b9\u6cd5\u300d\u3068\u3044\u3046\u91e3\u308a\u30bf\u30a4\u30c8\u30eb\u3067\u3059\u304c\u3001\u30ef\u30bf\u30af\u30b7\u7684\u306b\u306f\u4f8b\u5916\u51e6\u7406\u306b\u95a2\u3057\u3066\u306f\u4e00\u629e\u3067\u3059\u3002 \u4f8b\u5916\u51e6\u7406\u306b\u3064\u3044\u3066\u306f\u3001\u65b9\u6cd5\u8ad6\u7684\u306b\u3082\u8272\u3005\u3042\u308b\u306e\u306f\u5206\u304b\u3063\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u300c\u696d\u52d9\u300d\u3068\u3044\u3046\u7bc4\u56f2\u3067\u8003\u3048\u308b\u3068\u3001\u3068\u3044\u3046\u9078\u629e\u3067\u3059\u3002 UI\u304c\u3042\u308b\u5834\u5408 … \u7d9a\u304d\u3092\u8aad\u3080