My C# preferences

.editorconfig

# https://editorconfig.org/#supported-properties
# https://docs.microsoft.com/en-us/visualstudio/ide/create-portable-custom-editor-options?view=vs-2017#supported-settings

root = true

[*]
indent_style = space
indent_size = 4
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

# Formatting conventions
# (https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-formatting-conventions?view=vs-2017)

[*.cs]
# organize usings
dotnet_sort_system_directives_first = true
dotnet_separate_import_directive_groups = true

# newline
csharp_new_line_before_open_brace = all
csharp_new_line_before_else = true
csharp_new_line_before_catch = true
csharp_new_line_before_finally = true
csharp_new_line_before_members_in_object_initializers = true
csharp_new_line_before_members_in_anonymous_types = true
csharp_new_line_between_query_expression_clauses = true

# indentation
csharp_indent_case_contents = true
csharp_indent_switch_labels = true
csharp_indent_labels = flush_left
csharp_indent_block_contents = true
csharp_indent_braces = false
csharp_indent_case_contents_when_block = false

# spacing
csharp_space_after_cast = false
csharp_space_after_keywords_in_control_flow_statements = true
csharp_space_between_parentheses = false
csharp_space_before_colon_in_inheritance_clause = true
csharp_space_after_colon_in_inheritance_clause = true
csharp_space_around_binary_operators = ignore
csharp_space_between_method_declaration_parameter_list_parentheses = false
csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
csharp_space_between_method_declaration_name_and_open_parenthesis = false
csharp_space_between_method_call_parameter_list_parentheses = false
csharp_space_between_method_call_empty_parameter_list_parentheses = false
csharp_space_between_method_call_name_and_opening_parenthesis = false
csharp_space_after_comma = true
csharp_space_before_comma = false
csharp_space_after_dot = false
csharp_space_before_dot = false
csharp_space_after_semicolon_in_for_statement = true
csharp_space_before_semicolon_in_for_statement = false
csharp_space_around_declaration_statements = false
csharp_space_before_open_square_brackets = false
csharp_space_between_empty_square_brackets = false
csharp_space_between_square_brackets = false

# wrap
csharp_preserve_single_line_statements = false
csharp_preserve_single_line_blocks = true

# Language conventions
# (https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-language-conventions?view=vs-2017)

# this
dotnet_style_qualification_for_field = false:refactoring
dotnet_style_qualification_for_property = false:refactoring
dotnet_style_qualification_for_method = false:refactoring
dotnet_style_qualification_for_event = false:refactoring

# lang > framework type names
dotnet_style_predefined_type_for_locals_parameters_members = true:refactoring
dotnet_style_predefined_type_for_member_access = true:refactoring

# modifiers
dotnet_style_require_accessibility_modifiers = always:refactoring
csharp_preferred_modifier_order = public, private, protected, internal, static, extern, new, virtual, abstract, sealed, override, readonly, unsafe, volatile, async:refactoring
dotnet_style_readonly_field = true:refactoring

# parenthesis
dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:refactoring
dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:refactoring
dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:refactoring
dotnet_style_parentheses_in_other_operators = never_if_unnecessary:refactoring

# expressions
dotnet_style_object_initializer = true:refactoring
dotnet_style_collection_initializer = true:refactoring
dotnet_style_explicit_tuple_names = true:refactoring
dotnet_style_prefer_inferred_tuple_names = true:refactoring
dotnet_style_prefer_inferred_anonymous_type_member_names = true:refactoring
dotnet_style_prefer_auto_properties = true:refactoring
dotnet_style_prefer_is_null_check_over_reference_equality_method = true:refactoring
dotnet_style_prefer_conditional_expression_over_assignment = true:refactoring
dotnet_style_prefer_conditional_expression_over_return = true:refactoring
dotnet_style_prefer_compound_assignment = true:refactoring

# nulls
dotnet_style_coalesce_expression = true:refactoring
dotnet_style_null_propagation = true:refactoring

# parameters
dotnet_code_quality_unused_parameters = non_public:refactoring

# typing
csharp_style_var_for_built_in_types = true:refactoring
csharp_style_var_when_type_is_apparent = true:refactoring
csharp_style_var_elsewhere = false:refactoring

# expression-bodied
csharp_style_expression_bodied_methods = when_on_single_line:refactoring
csharp_style_expression_bodied_constructors = when_on_single_line:refactoring
csharp_style_expression_bodied_operators = when_on_single_line:refactoring
csharp_style_expression_bodied_properties = when_on_single_line:refactoring
csharp_style_expression_bodied_indexers = when_on_single_line:refactoring
csharp_style_expression_bodied_accessors = when_on_single_line:refactoring
csharp_style_expression_bodied_lambdas = when_on_single_line:refactoring
csharp_style_expression_bodied_local_functions = when_on_single_line:refactoring

# pattern matching
csharp_style_pattern_matching_over_is_with_cast_check = true:refactoring
csharp_style_pattern_matching_over_as_with_null_check = true:refactoring

# inline var
csharp_style_inlined_variable_declaration = true:refactoring

# default()
csharp_prefer_simple_default_expression = true:refactoring

# null checks
csharp_style_throw_expression = true:refactoring
csharp_style_conditional_delegate_call = false:refactoring

# braces
csharp_prefer_braces = false:refactoring

# unused
csharp_style_unused_value_expression_statement_preference = discard_variable:refactoring
csharp_style_unused_value_assignment_preference = discard_variable:refactoring

# index
csharp_style_prefer_index_operator = true:refactoring
csharp_style_prefer_range_operator = true:refactoring

# misc
csharp_style_deconstructed_variable_declaration = true:refactoring
csharp_style_pattern_local_over_anonymous_function = true:refactoring
csharp_using_directive_placement = outside_namespace:refactoring
csharp_prefer_static_local_function = true:refactoring
csharp_prefer_simple_using_statement = true:refactoring
csharp_style_prefer_switch_expression = true:refactoring

# Naming conventions
# (https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-naming-conventions?view=vs-2017)