/// <summary>
/// Returns an instance of a <see cref="T:System.Data.Common.DbProviderFactory" />.
/// </summary>
/// <param name="providerInvariantName">Invariant name of a provider.</param>
/// <returns>An instance of a <see cref="T:System.Data.Common.DbProviderFactory" /> for a specified provider name.</returns>
/// <exception cref="System.ArgumentNullException">providerInvariantName</exception>
/// <exception cref="System.Collections.Generic.KeyNotFoundException">Provider not found</exception>
/// <exception cref="System.InvalidCastException">Provider invalid</exception>
/// <exception cref="System.NotImplementedException">Provider not installed</exception>
public static DbProviderFactory GetFactory(string providerInvariantName)
{
if (string.IsNullOrWhiteSpace(providerInvariantName))
{
throw new ArgumentNullException(nameof(providerInvariantName));
}
DbProviderSetting dbProvider = DbProviderManager.GetProvider(providerInvariantName);
Type type = Type.GetType(dbProvider.Type);
if (null != type)
{
FieldInfo field = type.GetField("Instance", BindingFlags.DeclaredOnly | BindingFlags.Static | BindingFlags.Public);
#if NETSTANDARD1_3
if (null != field && field.FieldType.GetTypeInfo().IsSubclassOf(typeof(DbProviderFactory)))
#elif NETSTANDARD2_0
if (null != field && field.FieldType.IsSubclassOf(typeof(DbProviderFactory)))
#endif
{
object value = field.GetValue(null);
if (value != null)
{
return((DbProviderFactory)value);
}
}
throw new InvalidCastException("Provider invalid");
}
throw new NotImplementedException("Provider not installed");
}
/// <summary> /// provider invariant if exist /// </summary> /// <param name="providerInvariantName">provider invariant name.</param> /// <returns></returns> public static bool Exist(string providerInvariantName) => DbProviderManager.GetProviderExist(providerInvariantName);
/// <summary> /// Gets the <see cref="DbConnectionStringSetting"/> with the specified connection string name. /// </summary> /// <value> /// The <see cref="DbConnectionStringSetting"/>. /// </value> /// <param name="connectionStringName">Name of the connection string.</param> /// <returns></returns> public DbConnectionStringSetting this[string connectionStringName] => DbProviderManager.GetConnectionString(connectionStringName);
