added abp-modal tag static attribute

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalTagHelper.cs

@@ -6,6 +6,8 @@
 
         public bool? Centered { get; set; } = false;
 
+        public bool? Static { get; set; } = false;
+
         public AbpModalTagHelper(AbpModalTagHelperService tagHelperService)
             : base(tagHelperService)
         {

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalTagHelperService.cs

@@ -18,9 +18,9 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Modal
             var sb = new StringBuilder();
 
             var attritubutes = output.Attributes.Select(a => " " + a.Name + "=\"" + a.Value + "\" ").ToList();
-            var attritubutesAsJoin = string.Join(" ", attritubutes.ToArray()); 
-
-            sb.AppendLine("<div class=\""+ GetModalClasses() + "\" tabindex=\"-1\" role=\"dialog\" aria-hidden=\"true\" "+ attritubutesAsJoin + ">");
+            var attritubutesAsJoin = string.Join(" ", attritubutes.ToArray());
+
+            sb.AppendLine("<div class=\"" + GetModalClasses() + "\" tabindex=\"-1\" role=\"dialog\" aria-hidden=\"true\" " + attritubutesAsJoin + GetDataAttributes() + ">");
             sb.AppendLine("    <div class=\"" + GetModalDialogClasses() + "\" role=\"document\">");
             sb.AppendLine("        <div class=\"" + GetModalContentClasses() + "\">");
 
@@ -56,6 +56,16 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Modal
             return "modal-content";
         }
 
+        protected virtual string GetDataAttributes()
+        {
+
+            if (TagHelper.Static == true)
+            {
+                return "data-backdrop=\"static\" ";
+            }
+            return string.Empty;
+        }
+
         protected virtual string CreatePostContent()
         {
             var sb = new StringBuilder();