diff --git a/ConvertMoels/GramsSQLConvert.cs b/ConvertMoels/GramsSQLConvert.cs
index a4e0087..937b437 100644
--- a/ConvertMoels/GramsSQLConvert.cs
+++ b/ConvertMoels/GramsSQLConvert.cs
@@ -16,7 +16,7 @@ namespace Audit.ConvertMoels
     {
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            string G = value.ToString();
+            string G = System.Convert.ToString(value);
             if (G == "0")//判断单元格值是否为零
             {
                 return "red";//零返回红色