first commit

Infrastructure/Extensions/StringExtension.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Infrastructure.Extensions
+{
+    public static class StringExtension
+    {
+
+        /// <summary>
+        /// SQL条件拼接
+        /// </summary>
+        /// <param name="str"></param>
+        /// <param name="condition"></param>
+        /// <returns></returns>
+        public static string If(this string str, bool condition)
+        {
+            return condition ? str : string.Empty;
+        }
+        /// <summary>
+        /// 判断是否为空
+        /// </summary>
+        /// <param name="str"></param>
+        /// <returns></returns>
+        public static bool IfNotEmpty(this string str)
+        {
+            return !string.IsNullOrEmpty(str);
+        }
+    }
+}