webBrowser 操作无ID元素

int all = webBrowser1.Document.Body.All.Count;

			for (int i = 0; i < all; i++)
			{
				HtmlElement GetElement = webBrowser1.Document.All[i];
				//取到包含input标签的元素
				//_fmm.com._0.c
				if (GetElement.TagName.ToUpper().ToString() == "INPUT")
				{
					//根据input的Name属性，找到该元素并赋值：给用户名输入框赋值
					if (GetElement.Name.ToString() == "_fmm.com._0.c")
					{
						webBrowser1.Document.All[i].SetAttribute("value", "jcgh201098121");
					}
					
				}

				
			}