回答編集履歴
3
修正
test
CHANGED
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@@ -198,7 +198,7 @@
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198
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199
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[Benchmark]
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200
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201
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-
public string UseRef
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201
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public string UseReflection()
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{
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@@ -252,7 +252,7 @@
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|-------------- |------------:|-----------:|----------:|------------:|----------:|
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-
| UseRef
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255
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+
| UseReflection | 202.8417 ns | 13.9314 ns | 0.7636 ns | 203.0229 ns | 48 B |
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256
256
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| UseArray | 0.0055 ns | 0.1723 ns | 0.0094 ns | 0.0000 ns | - |
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2
修正
test
CHANGED
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@@ -234,8 +234,6 @@
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234
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{
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-
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-
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static void Main()
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{
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1
追記
test
CHANGED
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@@ -65,3 +65,199 @@
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65
65
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}
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66
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```
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68
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69
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70
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71
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文字列で値を持ってくるならDictionaryがありますし、別に文字列である必要が無いなら、配列やListもあります。
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72
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73
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```cs
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74
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75
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using System;
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76
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77
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using System.Collections.Generic;
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78
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79
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80
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81
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class Program
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82
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83
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{
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84
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85
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private static readonly string[] _ArrayMessage =
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86
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87
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{
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88
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89
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"ok",
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90
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91
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"ng",
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92
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93
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};
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94
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95
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96
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97
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private static readonly Dictionary<string, string> _DictMessage = new Dictionary<string, string>()
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98
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{
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{"Message1", "ok"},
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{"Message2", "ng"},
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105
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};
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106
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107
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108
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109
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static void Main()
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110
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111
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{
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Console.WriteLine(_ArrayMessage[0]);
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114
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115
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Console.WriteLine(_DictMessage["Message1"]);
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116
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118
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119
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Console.ReadKey();
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120
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121
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}
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122
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}
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125
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```
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126
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128
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129
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リフレクションの速度が非常に遅いと言われても、どれくらい遅いのかピンと来ないと思うので、[BenchmarkDotNet](https://github.com/dotnet/BenchmarkDotNet) の計測結果を載せておきます。
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130
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131
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132
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133
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```cs
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134
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135
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using BenchmarkDotNet.Attributes;
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136
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137
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using BenchmarkDotNet.Diagnosers;
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138
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139
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using BenchmarkDotNet.Running;
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140
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141
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using System.Collections.Generic;
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142
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143
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using System.Reflection;
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144
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145
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146
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147
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public static class Message
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148
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149
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{
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150
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151
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public static string Message1 { get; } = "ok";
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152
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153
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public static string Message2 { get; } = "ng";
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154
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155
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}
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156
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157
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158
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159
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//計測用テストクラス
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160
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161
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[MemoryDiagnoser(false)]
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162
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163
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[ShortRunJob]
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164
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165
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public class Test
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166
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167
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{
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168
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169
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private static readonly string[] _ArrayMessage =
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170
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171
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{
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172
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173
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"ok",
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174
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+
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175
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"ng",
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176
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177
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};
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178
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+
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179
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+
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180
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+
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181
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+
private static readonly Dictionary<string, string> _DictMessage = new Dictionary<string, string>()
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|
182
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+
|
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183
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+
{
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184
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+
|
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185
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{"Message1", "ok"},
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186
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+
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187
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{"Message2", "ng"},
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188
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+
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189
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};
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|
190
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+
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191
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+
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192
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+
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193
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+
private int _Index = 0;
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194
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+
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195
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private string _StringKey = "1";
|
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196
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+
|
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197
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+
|
|
198
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+
|
|
199
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+
[Benchmark]
|
|
200
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+
|
|
201
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+
public string UseRefrection()
|
|
202
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+
|
|
203
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+
{
|
|
204
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+
|
|
205
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+
var prop = typeof(Message).GetProperty(
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|
206
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+
|
|
207
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+
"Message" + _StringKey,
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|
208
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+
|
|
209
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BindingFlags.GetProperty | BindingFlags.Static | BindingFlags.Public);
|
|
210
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+
|
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211
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+
|
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212
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+
|
|
213
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+
return (string)prop.GetValue(null);
|
|
214
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+
|
|
215
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+
}
|
|
216
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+
|
|
217
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+
|
|
218
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+
|
|
219
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+
[Benchmark]
|
|
220
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+
|
|
221
|
+
public string UseArray() => _ArrayMessage[_Index];
|
|
222
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+
|
|
223
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+
|
|
224
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+
|
|
225
|
+
[Benchmark]
|
|
226
|
+
|
|
227
|
+
public string UseDictionary() => _DictMessage["Message" + _StringKey];
|
|
228
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+
|
|
229
|
+
}
|
|
230
|
+
|
|
231
|
+
|
|
232
|
+
|
|
233
|
+
class Program
|
|
234
|
+
|
|
235
|
+
{
|
|
236
|
+
|
|
237
|
+
|
|
238
|
+
|
|
239
|
+
static void Main()
|
|
240
|
+
|
|
241
|
+
{
|
|
242
|
+
|
|
243
|
+
BenchmarkRunner.Run<Test>();
|
|
244
|
+
|
|
245
|
+
}
|
|
246
|
+
|
|
247
|
+
}
|
|
248
|
+
|
|
249
|
+
|
|
250
|
+
|
|
251
|
+
（計測結果）
|
|
252
|
+
|
|
253
|
+
| Method | Mean | Error | StdDev | Median | Allocated |
|
|
254
|
+
|
|
255
|
+
|-------------- |------------:|-----------:|----------:|------------:|----------:|
|
|
256
|
+
|
|
257
|
+
| UseRefrection | 202.8417 ns | 13.9314 ns | 0.7636 ns | 203.0229 ns | 48 B |
|
|
258
|
+
|
|
259
|
+
| UseArray | 0.0055 ns | 0.1723 ns | 0.0094 ns | 0.0000 ns | - |
|
|
260
|
+
|
|
261
|
+
| UseDictionary | 47.3129 ns | 9.5924 ns | 0.5258 ns | 47.3259 ns | 48 B |
|
|
262
|
+
|
|
263
|
+
```
|