CleanCoder

1. A General Fast Method Invoker (https://www.codeproject.com/Articles/14593/A-General-Fast-Method-Invoker)
public static FastInvokeHandler GetMethodInvoker(MethodInfo methodInfo)
{
    DynamicMethod dynamicMethod = new DynamicMethod(string.Empty, 
                     typeof(object), new Type[] { typeof(object), 
                     typeof(object[]) }, 
                     methodInfo.DeclaringType.Module);
    ILGenerator il = dynamicMethod.GetILGenerator();
    ParameterInfo[] ps = methodInfo.GetParameters();
    Type[] paramTypes = new Type[ps.Length];

CleanCoder

// Rethrow exception with original callstack
ExceptionDispatchInfo.Capture(ret.Exception).Throw()

CleanCoder

#自动抓取Dump, 当异常信息包含特定字符串
1. procdump.exe -ma -e 1 -f <Exception Content> <PID>
   .i.e. procdump.exe -ma -e 1 -f "Commands ouy of sync" 3368

  -ma	Write a dump file with all process memory. The default dump format only includes thread and handle information.
  -e	Write a dump when the process encounters an unhandled exception. Include the 1 to create dump on first chance exceptions.
  -f	Filter the first chance exceptions. Wildcards (*) are supported. To just display the names without dumping, use a blank ("") filter.
  
  C:\>procdump -e 1 -f "" w3wp.exe
  Display without writing a dump, the exception codes/names of w3wp.exe

CleanCoder

# 索引
1）索引必须按照“idx_字段名称_字段名称[_字段名]”进行命名。		
2）唯一索引必须按照“uniq_字段名称_字段名称[_字段名]”进行命名。
3）名称必须使用小写。
4）中的字段数建议不超过5个，索引毕竟也占空间，请谨慎使用
5）主键是最左边一列是id，id不做业务使用，建表的时候必须有索引，不建议创建这个结构的表

# Create Table If Not Exists
CREATE TABLE IF NOT EXISTS `shares` (
 `id` int(64) NOT NULL auto_increment,

CleanCoder

public class ObjectPoolAsync<T> : IDisposable
{
    private readonly BufferBlock<T> buffer;
    private readonly Func<T> factory;
    private readonly int msecTimeout;

    public ObjectPoolAsync (int initialCount, Func<T> factory, CancellationToken cts, int msecTimeout = 0)
    {
        this.msecTimeout = msecTimeout;
        buffer = new BufferBlock<T> ( new DataflowBlockOptions { CancellationToken = cts });

CleanCoder

struct Result<T> {
    public T Ok { get; }
    public Exception Error { get; }
    public bool IsFailed { get => Error != null; }
    public bool IsOk => !IsFailed;

    public Result (T ok) {
        Ok = ok;
        Error = default (Exception);
    }

CleanCoder

static async Task<T> Otherwise<T> (this Task<T> task, Func<Task<T>> orTask) {
    task.ContinueWith (async innerTask => {
        if (innerTask.Status == TaskStatus.Faulted)
            return await orTask ();

        return await Task.FromResult<T> (innerTask.Result);
    }).Unwrap ();
}

static async Task<T> Retry<T> (Func<Task<T>> task, int retries, TimeSpan delay, CancellationToken cts = default (CancellationToken)) {

CleanCoder

clear # clean screen

netstat -tulpn | grep LISTEN           # check the listening ports and applications

CleanCoder

// Dynamic Invoke Generic Method
MethodInfo methodInfo = typeof(MyClass).GetMethod("TestProc");
MethodInfo genericMethod = methodInfo.MakeGenericMethod(new[] { typeof(string) });
genericMethod.Invoke(null, new[] { "Hello" }); // the first parameter is null, means it is a static method


https://www.codeproject.com/Articles/584720/ExpressionplusbasedplusPropertyplusGettersplusandp
// returns property getter
public static Func<TObject, TProperty> GetPropGetter<TObject, TProperty>(string propertyName)
{

CleanCoder

1) 准备工作
.loadby sos clr
.cordll -ve -u -l
.load  <<path>>\sosex.dll
.load  <<path>>\mex.dll
.symfix
.reload

2) 常用方法
!pe [<exceptionAddr>]	most recent exception data (don’t forget the external stack)