20220313 3张表格 导出excel功能

20220313_Excel/TempTask.WebEntry/Tools/Extension.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace TempTask.WebEntry.Tools
+{
+    /// <summary>
+    /// 扩展
+    /// </summary>
+    public static class Extension
+    {
+        /// <summary>
+        /// 将字符串转换为整数
+        /// </summary>
+        /// <param name="str"></param>
+        /// <param name="defaultValue">转换失败时的默认值</param>
+        /// <returns></returns>
+        public static int ToInt(this string str, int defaultValue = int.MinValue)
+        {
+            return int.TryParse(str, out int i) ? i : defaultValue;
+        }
+    }
+}