System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0.

System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0. at System.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyvalue) at System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary2 parsetable, String connectionString, Boolean buildChain, Dictionary2 synonyms, Boolean firstKey) at System.Data.Common.DbConnectionOptions…ctor(String connectionString, Dictionary`2 synonyms, Boolean useOdbcRules) at System.Data.Common.DbConnectionStringBuilder.set_ConnectionString(String value) at Npgsql.NpgsqlConnectionStringBuilder…ctor(String connectionString) at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlDatabaseCreator.Exists() at Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists() at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabaseImpl(String targetMigration, String contextType) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_0.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action) Format of the initialization string does not conform to specification starting at index 0.

[roji]

The value with the special character needs to be quoted, i.e. Server=localhost;Port=5432;Database=testdb;User Id=user;Password="password'".

[dvdvardanyan]

I get similar error message when password starts or ends with a single quote. Then it fails on object init (when single quote is in the middle of the text it parses without errors):

NpgsqlConnection con = new NpgsqlConnection(connection.ConnectionString);

with the following error message:

Format of the initialization string does not conform to specification starting at index 56.

at System.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyvalue) at System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary2 parsetable, String connectionString, Boolean buildChain, Dictionary2 synonyms, Boolean firstKey) at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Dictionary2 synonyms, Boolean useOdbcRules) at System.Data.Common.DbConnectionStringBuilder.set_ConnectionString(String value) at Npgsql.NpgsqlConnectionStringBuilder…ctor(String connectionString) at Npgsql.NpgsqlConnection.GetPoolAndSettings() at Npgsql.NpgsqlConnection.set_ConnectionString(String value) at Npgsql.NpgsqlConnection…ctor(String connectionString) at Persistence.PostgreSql.DataAccess.PostgreSqlConnection.<TestConnectionAsync>d__0.MoveNext() in D:\…\src\Infras…`

Failing connection strings:

Server=localhost;Port=5432;Database=testdb;User Id=user;Password=password’; Server=localhost;Port=5432;Database=testdb;User Id=user;Password='password;

Package reference:

<PackageReference Include=“Npgsql” Version=“4.1.3” />`