Created
June 7, 2024 16:56
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Validate a SQL Connection String
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| public static class SqlConnectionStringValidator | |
| { | |
| public enum ErrorReason { None, ServerNetwork, Database, UserPassword, Other } | |
| public static bool TryValidateConnectionString(string server, string database, string user, string password, out string connectionString, out ErrorReason reason, out string message) | |
| { | |
| connectionString = default; | |
| if (!TryValidateValues(server, database, user, password, out reason, out message)) | |
| { | |
| return false; | |
| } | |
| if (!TryBuildConnectionString(server, database, user, password, out connectionString, out reason, out message)) | |
| { | |
| return false; | |
| } | |
| if (!TryValidateConnectionString(connectionString, out reason, out message)) | |
| { | |
| return false; | |
| } | |
| return reason == ErrorReason.None; | |
| } | |
| private static bool TryValidateConnectionString(string connectionString, out ErrorReason reason, out string message) | |
| { | |
| reason = ErrorReason.None; | |
| message = default; | |
| try | |
| { | |
| using var connection = new SqlConnection(connectionString); | |
| connection.Open(); | |
| } | |
| catch (SqlException ex) when (new[] { 53, 10060, 11001 }.Contains(ex.Number)) | |
| { | |
| reason = ErrorReason.ServerNetwork; | |
| message = ex.Message; | |
| } | |
| catch (SqlException ex) when (ex.Number == 4060) | |
| { | |
| reason = ErrorReason.Database; | |
| message = ex.Message; | |
| } | |
| catch (SqlException ex) when (ex.Number == 18456) | |
| { | |
| reason = ErrorReason.UserPassword; | |
| message = ex.Message; | |
| } | |
| catch (Exception ex) | |
| { | |
| reason = ErrorReason.Other; | |
| message = ex.Message; | |
| } | |
| return reason == ErrorReason.None; | |
| } | |
| private static bool TryBuildConnectionString(string server, string database, string user, string password, out string connectionString, out ErrorReason reason, out string message) | |
| { | |
| connectionString = default; | |
| reason = ErrorReason.None; | |
| message = default; | |
| try | |
| { | |
| connectionString = new SqlConnectionStringBuilder | |
| { | |
| DataSource = server, | |
| InitialCatalog = database, | |
| UserID = user, | |
| Password = password | |
| }.ConnectionString; | |
| } | |
| catch (Exception ex) | |
| { | |
| reason = ErrorReason.Other; | |
| message = ex.Message; | |
| } | |
| return reason == ErrorReason.None; | |
| } | |
| private static bool TryValidateValues(string server, string database, string user, string password, out ErrorReason reason, out string message) | |
| { | |
| reason = ErrorReason.None; | |
| message = default; | |
| if (string.IsNullOrWhiteSpace(server)) | |
| { | |
| reason = ErrorReason.ServerNetwork; | |
| message = "Server name is required"; | |
| } | |
| else if (string.IsNullOrWhiteSpace(database)) | |
| { | |
| reason = ErrorReason.Database; | |
| message = "Database name is required"; | |
| } | |
| else if (string.IsNullOrWhiteSpace(user)) | |
| { | |
| reason = ErrorReason.UserPassword; | |
| message = "User name is required"; | |
| } | |
| else if (string.IsNullOrWhiteSpace(password)) | |
| { | |
| reason = ErrorReason.UserPassword; | |
| message = "Password is required"; | |
| } | |
| return reason == ErrorReason.None; | |
| } | |
| } |
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