// Google Sign-infinalcredential=GoogleAuthProvider.credential(idToken:idToken);// Email and password sign-infinalcredential=EmailAuthProvider.credential(email:emailAddress,password:password);// Etc.
try{finaluserCredential=awaitFirebaseAuth.instance.currentUser?.linkWithCredential(credential);}onFirebaseAuthExceptioncatch(e){switch(e.code){case"provider-already-linked":print("The provider has already been linked to the user.");break;case"invalid-credential":print("The provider's credential is not valid.");break;case"credential-already-in-use":print("The account corresponding to the credential already exists, ""or is already linked to a Firebase User.");break;// See the API reference for the full list of error codes.default:print("Unknown error.");}```
หากต้องการยกเลิกการลิงก์ผู้ให้บริการตรวจสอบสิทธิ์จากบัญชีผู้ใช้ ให้ส่งรหัสผู้ให้บริการไปยังเมธอด unlink() คุณสามารถรับรหัสผู้ให้บริการของผู้ให้บริการการตรวจสอบสิทธิ์ที่ลิงก์กับ
ผู้ใช้ได้จากพร็อพเพอร์ตี้ providerData ของออบเจ็กต์ User
try{awaitFirebaseAuth.instance.currentUser?.unlink(providerId);}onFirebaseAuthExceptioncatch(e){switch(e.code){case"no-such-provider":print("The user isn't linked to the provider or the provider ""doesn't exist.");break;default:print("Unknown error.");}}
[[["เข้าใจง่าย","easyToUnderstand","thumb-up"],["แก้ปัญหาของฉันได้","solvedMyProblem","thumb-up"],["อื่นๆ","otherUp","thumb-up"]],[["ไม่มีข้อมูลที่ฉันต้องการ","missingTheInformationINeed","thumb-down"],["ซับซ้อนเกินไป/มีหลายขั้นตอนมากเกินไป","tooComplicatedTooManySteps","thumb-down"],["ล้าสมัย","outOfDate","thumb-down"],["ปัญหาเกี่ยวกับการแปล","translationIssue","thumb-down"],["ตัวอย่าง/ปัญหาเกี่ยวกับโค้ด","samplesCodeIssue","thumb-down"],["อื่นๆ","otherDown","thumb-down"]],["อัปเดตล่าสุด 2025-08-28 UTC"],[],[],null,["\u003cbr /\u003e\n\nYou can allow users to sign in to your app using multiple authentication\nproviders by linking auth provider credentials to an existing user account.\nUsers are identifiable by the same Firebase user ID regardless of the\nauthentication provider they used to sign in. For example, a user who signed in\nwith a password can link a Google account and sign in with either method in the\nfuture. Or, an anonymous user can link a Facebook account and then, later, sign\nin with Facebook to continue using your app.\n\nBefore you begin\n\nAdd support for two or more authentication providers (possibly including\nanonymous authentication) to your app.\n\nLink auth provider credentials to a user account\n\nTo link auth provider credentials to an existing user account:\n\n1. Sign in the user using any authentication provider or method.\n\n2. Complete the sign-in flow for the new authentication provider up to, but not\n including, calling one of the `signInWith`- methods. For example, get\n the user's Google ID token, Facebook access token, or email and password.\n\n3. Get a `Credential` object for the new authentication provider:\n\n // Google Sign-in\n final credential = GoogleAuthProvider.credential(idToken: idToken);\n\n // Email and password sign-in\n final credential =\n EmailAuthProvider.credential(email: emailAddress, password: password);\n\n // Etc.\n\n4. Pass the `Credential` object to the sign-in user's `linkWithCredential()`\n method:\n\n try {\n final userCredential = await FirebaseAuth.instance.currentUser\n ?.linkWithCredential(credential);\n } on FirebaseAuthException catch (e) {\n switch (e.code) {\n case \"provider-already-linked\":\n print(\"The provider has already been linked to the user.\");\n break;\n case \"invalid-credential\":\n print(\"The provider's credential is not valid.\");\n break;\n case \"credential-already-in-use\":\n print(\"The account corresponding to the credential already exists, \"\n \"or is already linked to a Firebase User.\");\n break;\n // See the API reference for the full list of error codes.\n default:\n print(\"Unknown error.\");\n }\n ```\n\nIf the call to `linkWithCredential()` succeeds, the user can now sign in using\nany linked authentication provider and access the same Firebase data.\n\nUnlink an auth provider from a user account\n\nYou can unlink an auth provider from an account, so that the user can no\nlonger sign in with that provider.\n\nTo unlink an auth provider from a user account, pass the provider ID to the\n`unlink()` method. You can get the provider IDs of the auth providers linked to\na user from the `User` object's `providerData` property. \n\n try {\n await FirebaseAuth.instance.currentUser?.unlink(providerId);\n } on FirebaseAuthException catch (e) {\n switch (e.code) {\n case \"no-such-provider\":\n print(\"The user isn't linked to the provider or the provider \"\n \"doesn't exist.\");\n break;\n default:\n print(\"Unknown error.\");\n }\n }\n\nTroubleshooting\n\nIf you encounter errors when trying to link multiple accounts, see the\n[documentation on verified email addresses](https://firebase.google.com/docs/auth/users#verified_email_addresses)."]]
