{"id":991,"date":"2026-10-28T11:36:03","date_gmt":"2026-10-28T02:36:03","guid":{"rendered":"https:\/\/csharp.ihavenomoney.co.kr\/?p=991"},"modified":"2026-10-28T11:36:03","modified_gmt":"2026-10-28T02:36:03","slug":"di%ec%9d%98%ec%a1%b4%ec%84%b1-%ec%a3%bc%ec%9e%85-%ec%bb%a8%ed%85%8c%ec%9d%b4%eb%84%88","status":"publish","type":"post","link":"https:\/\/csharp.ihavenomoney.co.kr\/?p=991","title":{"rendered":"DI(\uc758\uc874\uc131 \uc8fc\uc785) \ucee8\ud14c\uc774\ub108"},"content":{"rendered":"\n

DI(\uc758\uc874\uc131 \uc8fc\uc785) \ucee8\ud14c\uc774\ub108 \uc0c1\uc138 \uc124\uba85<\/h2>\n\n\n\n

1. \uba3c\uc800 “\uc758\uc874\uc131”\uc774\ub780?<\/h3>\n\n\n\n

\uc5b4\ub5a4 \ud074\ub798\uc2a4\uac00 \ub3d9\uc791\ud558\ub824\uace0 \ub2e4\ub978 \ud074\ub798\uc2a4\ub97c \ud544\uc694\ub85c \ud558\uba74, \uadf8 \ud074\ub798\uc2a4\uac00 \uc758\uc874\uc131<\/strong>\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n

csharp<\/p>\n\n\n\n

public class ApprovalService\n{\n    private readonly CountryRepository _repo;\n\n    public ApprovalService()\n    {\n        _repo = new CountryRepository();   \/\/ \uc9c1\uc811 \uc0dd\uc131\n    }\n}<\/code><\/pre>\n\n\n\n
ApprovalService<\/code>\ub294 CountryRepository<\/code>\uc5d0 \uc758\uc874\ud569\ub2c8\ub2e4. \uc704\ucc98\ub7fc \uc548\uc5d0\uc11c \uc9c1\uc811 new<\/code><\/strong> \ud558\uba74 \ubb38\uc81c\uac00 \uc0dd\uae41\ub2c8\ub2e4.<\/p>\n\n\n\n
\ubb38\uc81c<\/th>\uc124\uba85<\/th><\/tr><\/thead>
\uac15\ud55c \uacb0\ud569<\/td>CountryRepository<\/code>\ub97c \ubc14\uafb8\ub824\uba74 ApprovalService<\/code>\ub3c4 \uc218\uc815\ud574\uc57c \ud568<\/td><\/tr>
\ud14c\uc2a4\ud2b8 \uc5b4\ub824\uc6c0<\/td>\uac00\uc9dc(Mock) \uac1d\uccb4\ub85c \ubc14\uafd4 \ub07c\uc6b8 \uc218 \uc5c6\uc74c<\/td><\/tr>
\uc0dd\uc131 \ubcf5\uc7a1\ub3c4<\/td>CountryRepository<\/code>\uac00 \ub610 \ub2e4\ub978 \uc758\uc874\uc131(DB \uc5f0\uacb0 \ub4f1)\uc744 \uc694\uad6c\ud558\uba74 new<\/code> \uccb4\uc778\uc774 \uae38\uc5b4\uc9d0<\/td><\/tr>
\uc218\uba85 \uad00\ub9ac \ubd88\uac00<\/td>\uacf5\uc720\ud560\uc9c0, \ub9e4\ubc88 \ub9cc\ub4e4\uc9c0 \uacb0\uc815\ud560 \uacf3\uc774 \uc5c6\uc74c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
2. \uc758\uc874\uc131 \uc8fc\uc785(DI)\uc774\ub780?<\/h3>\n\n\n\n
\ud544\uc694\ud55c \uac1d\uccb4\ub97c \ub0b4\uac00 \ub9cc\ub4e4\uc9c0 \uc54a\uace0, \ubc16\uc5d0\uc11c \ub123\uc5b4 \uc8fc\ub294 \ubc29\uc2dd<\/strong>\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
csharp<\/p>\n\n\n\n
public class ApprovalService\n{\n    private readonly CountryRepository _repo;\n\n    public ApprovalService(CountryRepository repo)   \/\/ \uc0dd\uc131\uc790\ub85c \"\ubc1b\uc74c\"\n    {\n        _repo = repo;\n    }\n}<\/code><\/pre>\n\n\n\n
ApprovalService<\/code>\ub294 “\ub204\uac00 \ub9cc\ub4e4\uc5c8\ub294\uc9c0” \ubaa8\ub974\uace0, \uadf8\ub0e5 \ubc1b\uc544\uc11c \uc501\ub2c8\ub2e4. \uc774\ub97c \uc81c\uc5b4\uc758 \uc5ed\uc804(IoC, Inversion of Control)<\/strong> \uc774\ub77c\uace0\ub3c4 \ud569\ub2c8\ub2e4. \uac1d\uccb4 \uc0dd\uc131\uc758 \uc81c\uc5b4\uad8c\uc774 \ud074\ub798\uc2a4\uc5d0\uc11c \uc678\ubd80\ub85c \ub118\uc5b4\uac14\uae30 \ub54c\ubb38\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
3. DI \ucee8\ud14c\uc774\ub108\ub780?<\/h3>\n\n\n\n
\uc704\ucc98\ub7fc “\ubc16\uc5d0\uc11c \ub123\uc5b4 \uc8fc\ub294” \uc77c\uc744 \uc790\ub3d9\uc73c\ub85c \ud574 \uc8fc\ub294 \uc7a5\uce58<\/strong>\uc785\ub2c8\ub2e4. ASP.NET Core\uc5d0\ub294 \uae30\ubcf8 \ub0b4\uc7a5\ub418\uc5b4 \uc788\uace0, builder.Services<\/code>\uac00 \ubc14\ub85c \uadf8 \ucee8\ud14c\uc774\ub108\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
\ucee8\ud14c\uc774\ub108\uac00 \ud558\ub294 \uc77c\uc740 \uc138 \uac00\uc9c0\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
    \n
  1. \ub4f1\ub85d<\/strong>: “\uc774 \ud0c0\uc785\uc740 \uc774\ub807\uac8c \ub9cc\ub4e4\uc5b4\ub77c” (\uc6b0\ub9ac\uac00 AddScoped<\/code> \ub4f1\uc73c\ub85c \uc54c\ub824 \uc90c)<\/li>\n\n\n\n
  2. \uc0dd\uc131<\/strong>: \ud544\uc694\ud560 \ub54c \uc0dd\uc131\uc790\ub97c \ubd84\uc11d\ud574 \uc758\uc874\uc131\uc744 \uc7ac\uadc0\uc801\uc73c\ub85c \ub9cc\ub4e4\uc5b4 \ub0c4<\/li>\n\n\n\n
  3. \uc218\uba85 \uad00\ub9ac<\/strong>: \uc5b8\uc81c \ub9cc\ub4e4\uace0 \uc5b8\uc81c \ubc84\ub9b4\uc9c0 \uad00\ub9ac (Dispose\uae4c\uc9c0 \uc790\ub3d9 \ud638\ucd9c)<\/li>\n<\/ol>\n\n\n\n
    4. \uc774 \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c\uc758 \ub3d9\uc791 \ud750\ub984<\/h3>\n\n\n\n
    \ub4f1\ub85d:<\/p>\n\n\n\n
    csharp<\/p>\n\n\n\n
    builder.Services.AddScoped<CountryRepository>();\nbuilder.Services.AddScoped<ApprovalService>();\nbuilder.Services.AddSingleton<IsoCatalog>();<\/code><\/pre>\n\n\n\n
    \ucee8\ud2b8\ub864\ub7ec(\uac00\uc815):<\/p>\n\n\n\n
    csharp<\/p>\n\n\n\n
    public class CountryController : ControllerBase\n{\n    private readonly ApprovalService _approval;\n\n    public CountryController(ApprovalService approval)   \/\/ \ucee8\ud2b8\ub864\ub7ec\ub294 \uc774\uac83\ub9cc \uc694\uccad\n    {\n        _approval = approval;\n    }\n}<\/code><\/pre>\n\n\n\n
    \uc694\uccad\uc774 \ub4e4\uc5b4\uc624\uba74 \ucee8\ud14c\uc774\ub108\uac00 \uc774\ub807\uac8c \ucc98\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
    \uc694\uccad \ub3c4\ucc29\n  \u2514\u2500 CountryController \ud544\uc694\n       \u2514\u2500 \uc0dd\uc131\uc790\uc5d0 ApprovalService \ud544\uc694\n            \u2514\u2500 \uc0dd\uc131\uc790\uc5d0 CountryRepository \ud544\uc694 \u2192 \uc0dd\uc131\n            \u2514\u2500 (\ud544\uc694\ud558\uba74) IsoCatalog \u2192 \uc774\ubbf8 \uc788\ub294 \uc2f1\uae00\ud1a4 \uc7ac\uc0ac\uc6a9\n            \u2190 ApprovalService \uc0dd\uc131 \uc644\ub8cc\n       \u2190 CountryController \uc0dd\uc131 \uc644\ub8cc\n  \u2514\u2500 \uc694\uccad \ucc98\ub9ac \ud6c4, \uc694\uccad\uc774 \ub05d\ub098\uba74 Scoped \uac1d\uccb4\ub4e4 Dispose<\/code><\/pre>\n\n\n\n
    \uc6b0\ub9ac\ub294 new<\/code>\ub97c \ud55c \ubc88\ub3c4 \uc4f0\uc9c0 \uc54a\uc558\ub294\ub370 \uc5f0\uacb0\uc774 \ub05d\uae4c\uc9c0 \uc774\uc5b4\uc9d1\ub2c8\ub2e4. \uc758\uc874\uc131\uc774 \uba87 \ub2e8\uacc4\ub85c \uae4a\uc5b4\uc838\ub3c4 \ucee8\ud14c\uc774\ub108\uac00 \uc54c\uc544\uc11c \ud480\uc5b4 \uc90d\ub2c8\ub2e4.<\/p>\n\n\n\n
    5. \uc218\uba85(Lifetime) \ub2e4\uc2dc \uc815\ub9ac<\/h3>\n\n\n\n
    \uc218\uba85<\/th>\uc0dd\uc131 \uc2dc\uc810<\/th>\uc18c\uba78 \uc2dc\uc810<\/th>\uc608<\/th><\/tr><\/thead>
    Singleton<\/strong><\/td>\ucc98\uc74c \uc694\uccad\ub420 \ub54c 1\ubc88<\/td>\uc571 \uc885\ub8cc<\/td>IsoCatalog<\/code><\/td><\/tr>
    Scoped<\/strong><\/td>HTTP \uc694\uccad\ub9c8\ub2e4 1\ubc88<\/td>\uc694\uccad \uc885\ub8cc<\/td>CountryRepository<\/code><\/td><\/tr>
    Transient<\/strong><\/td>\uc8fc\uc785\ubc1b\uc744 \ub54c\ub9c8\ub2e4<\/td>\uc2a4\ucf54\ud504 \uc885\ub8cc \uc2dc Dispose<\/td>\uac00\ubcbc\uc6b4 \uc720\ud2f8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \uac19\uc740 \uc694\uccad \uc548\uc5d0\uc11c ApprovalService<\/code>\uc640 CountryController<\/code>\uac00 \ub458 \ub2e4 CountryRepository<\/code>\ub97c \ubc1b\uc73c\uba74 \uac19\uc740 \uc778\uc2a4\ud134\uc2a4<\/strong>\ub97c \uacf5\uc720\ud569\ub2c8\ub2e4 (Scoped\uc774\ubbc0\ub85c). \uc774\uac83\uc774 \uac19\uc740 DB \ud2b8\ub79c\uc7ad\uc158\/\ucee8\ud14d\uc2a4\ud2b8\ub97c \uc694\uccad \uc548\uc5d0\uc11c \uacf5\uc720\ud558\uac8c \ud574 \uc8fc\ub294 \uc6d0\ub9ac\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
    6. \uc778\ud130\ud398\uc774\uc2a4\uc640 \ud568\uaed8 \uc4f0\ub294 \uac83\uc774 \uc77c\ubc18\uc801<\/h3>\n\n\n\n
    \uc774 \ud504\ub85c\uc81d\ud2b8\ub294 \uad6c\uccb4 \ud074\ub798\uc2a4\ub97c \uc9c1\uc811 \ub4f1\ub85d\ud588\uc9c0\ub9cc, \ubcf4\ud1b5\uc740 \uc778\ud130\ud398\uc774\uc2a4\ub85c \ub4f1\ub85d\ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
    csharp<\/p>\n\n\n\n
    builder.Services.AddScoped<ICountryRepository, CountryRepository>();<\/code><\/pre>\n\n\n\n
    csharp<\/p>\n\n\n\n
    public ApprovalService(ICountryRepository repo) { ... }<\/code><\/pre>\n\n\n\n
    \uc774\ub7ec\uba74 \uad6c\ud604\uc744 \ubc14\uafd4\ub3c4(\uc608: SQL Server \u2192 PostgreSQL) \ub4f1\ub85d \ud55c \uc904\ub9cc \ubc14\uafb8\uba74 \ub418\uace0, \ud14c\uc2a4\ud2b8\uc5d0\uc11c\ub294 \uac00\uc9dc \uad6c\ud604\uc744 \ub07c\uc6b8 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n\n
    csharp<\/p>\n\n\n\n
    \/\/ \ud14c\uc2a4\ud2b8 \uc608\nvar fake = new FakeCountryRepository();\nvar service = new ApprovalService(fake);   \/\/ \ucee8\ud14c\uc774\ub108 \uc5c6\uc774\ub3c4 \uc8fc\uc785 \uac00\ub2a5<\/code><\/pre>\n\n\n\n
    7. \uc8fc\uc785 \ubc29\ubc95<\/h3>\n\n\n\n
    \ubc29\ubc95<\/th>\uc608<\/th><\/tr><\/thead>
    \uc0dd\uc131\uc790 \uc8fc\uc785<\/strong> (\uac00\uc7a5 \uc77c\ubc18\uc801)<\/td>public Foo(Bar bar)<\/code><\/td><\/tr>
    \uba54\uc11c\ub4dc \uc8fc\uc785<\/td>\ucee8\ud2b8\ub864\ub7ec \uc561\uc158\uc5d0 [FromServices] Bar bar<\/code><\/td><\/tr>
    \ubbf8\ub4e4\uc6e8\uc5b4 Invoke<\/code> \ud30c\ub77c\ubbf8\ud130<\/td>Invoke(HttpContext ctx, Bar bar)<\/code><\/td><\/tr>
    Minimal API \ud30c\ub77c\ubbf8\ud130<\/td>app.MapGet(\"\/\", (Bar bar) => ...)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    8. \uc790\uc8fc \ud558\ub294 \uc2e4\uc218<\/h3>\n\n\n\n
    1) \ub4f1\ub85d \uc548 \ud558\uace0 \uc8fc\uc785 \uc694\uccad<\/strong><\/p>\n\n\n\n
    InvalidOperationException: Unable to resolve service for type 'CountryRepository'<\/code><\/pre>\n\n\n\n
    AddXxx<\/code>\ub97c \ube60\ub728\ub9ac\uba74 \ub098\ub294 \uac00\uc7a5 \ud754\ud55c \uc624\ub958\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
    2) \uc218\uba85 \ubd88\uc77c\uce58 (Captive Dependency)<\/strong>
    Singleton\uc774 Scoped\ub97c \uc8fc\uc785\ubc1b\uc73c\uba74, Scoped \uac1d\uccb4\uac00 \uc694\uccad\uc774 \ub05d\ub098\ub3c4 \uc0b4\uc544\ub0a8\uc544 \uc624\ub798\ub41c DB \uc5f0\uacb0\uc744 \uc950\uac8c \ub429\ub2c8\ub2e4. \uac1c\ubc1c \ud658\uacbd\uc5d0\uc11c\ub294 \uc608\uc678\ub85c \uc54c\ub824 \uc90d\ub2c8\ub2e4. \uaddc\uce59\uc740 “\uae34 \uc218\uba85\uc774 \uc9e7\uc740 \uc218\uba85\uc5d0 \uc758\uc874\ud558\uc9c0 \uc54a\uae30”\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n
    3) \uc21c\ud658 \uc758\uc874<\/strong>
    A<\/code>\uac00 B<\/code>\ub97c, B<\/code>\uac00 A<\/code>\ub97c \uc0dd\uc131\uc790\uc5d0\uc11c \uc694\uad6c\ud558\uba74 \ucee8\ud14c\uc774\ub108\uac00 \ub9cc\ub4e4 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4. \uc124\uacc4\ub97c \ub098\ub220\uc57c \ud569\ub2c8\ub2e4.<\/p>\n\n\n\n
    4) \uc11c\ube44\uc2a4 \ub85c\ucf00\uc774\ud130 \ub0a8\uc6a9<\/strong>
    IServiceProvider<\/code>\uc5d0\uc11c \uc9c1\uc811 GetService<T>()<\/code>\ub85c \uaebc\ub0b4 \uc4f0\uba74 \uc758\uc874\uc131\uc774 \uc228\uaca8\uc838 DI\uc758 \uc7a5\uc810\uc774 \uc0ac\ub77c\uc9d1\ub2c8\ub2e4. \uc0dd\uc131\uc790 \uc8fc\uc785\uc744 \uc6b0\uc120\ud558\uc138\uc694.<\/p>\n\n\n\n
    9. \uc65c \uc4f0\ub098, \ud55c \uc904 \uc694\uc57d<\/h3>\n\n\n\n
    \uc7a5\uc810<\/th>\uc124\uba85<\/th><\/tr><\/thead>
    \ub290\uc2a8\ud55c \uacb0\ud569<\/td>\uad6c\ud604 \uad50\uccb4\uac00 \uc26c\uc6c0<\/td><\/tr>
    \ud14c\uc2a4\ud2b8 \uc6a9\uc774<\/td>Mock\/Fake \uc8fc\uc785 \uac00\ub2a5<\/td><\/tr>
    \uc218\uba85 \uc77c\uad04 \uad00\ub9ac<\/td>\uc0dd\uc131\u00b7\uacf5\uc720\u00b7\ud574\uc81c\ub97c \ucee8\ud14c\uc774\ub108\uac00 \ub2f4\ub2f9<\/td><\/tr>
    \ucf54\ub4dc \ub2e8\uc21c\ud654<\/td>new<\/code> \uccb4\uc778 \uc81c\uac70, \uc124\uc815\uc774 \ud55c\uacf3(Program.cs<\/code>)\uc5d0 \ubaa8\uc784<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \uc815\ub9ac\ud558\uba74 “\ud074\ub798\uc2a4\ub294 \ud544\uc694\ud55c \uac83\uc744 \uc120\uc5b8\ub9cc \ud558\uace0, \ub9cc\ub4e4\uace0 \uc5f0\uacb0\ud558\ub294 \uc77c\uc740 builder.Services<\/code>\uac00 \ud55c\ub2e4”<\/strong> \uac00 DI \ucee8\ud14c\uc774\ub108\uc758 \ud575\uc2ec\uc785\ub2c8\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
    DI(\uc758\uc874\uc131 \uc8fc\uc785) \ucee8\ud14c\uc774\ub108 \uc0c1\uc138 \uc124\uba85 1. \uba3c\uc800 “\uc758\uc874\uc131”\uc774\ub780? \uc5b4\ub5a4 \ud074\ub798\uc2a4\uac00 \ub3d9\uc791\ud558\ub824\uace0 \ub2e4\ub978 \ud074\ub798\uc2a4\ub97c \ud544\uc694\ub85c \ud558\uba74, \uadf8 \ud074\ub798\uc2a4\uac00 \uc758\uc874\uc131\uc785\ub2c8\ub2e4. csharp ApprovalService\ub294 CountryRepository\uc5d0 \uc758\uc874\ud569\ub2c8\ub2e4. \uc704\ucc98\ub7fc \uc548\uc5d0\uc11c \uc9c1\uc811 new \ud558\uba74 \ubb38\uc81c\uac00 \uc0dd\uae41\ub2c8\ub2e4. \ubb38\uc81c \uc124\uba85 \uac15\ud55c \uacb0\ud569 CountryRepository\ub97c \ubc14\uafb8\ub824\uba74 ApprovalService\ub3c4 \uc218\uc815\ud574\uc57c \ud568 \ud14c\uc2a4\ud2b8 \uc5b4\ub824\uc6c0 \uac00\uc9dc(Mock) \uac1d\uccb4\ub85c \ubc14\uafd4 \ub07c\uc6b8 \uc218 \uc5c6\uc74c \uc0dd\uc131 \ubcf5\uc7a1\ub3c4 CountryRepository\uac00 \ub610 \ub2e4\ub978 \uc758\uc874\uc131(DB \uc5f0\uacb0 \ub4f1)\uc744 \uc694\uad6c\ud558\uba74\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[],"class_list":["post-991","post","type-post","status-publish","format-standard","hentry","category-net-core"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=991"}],"version-history":[{"count":1,"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/991\/revisions"}],"predecessor-version":[{"id":992,"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/991\/revisions\/992"}],"wp:attachment":[{"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/csharp.ihavenomoney.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}