GetManifestResourceStream 加载为null

Assembly currentAssembly = Assembly.GetExecutingAssembly();
string content = string.Empty;
using (Stream stream = currentAssembly.GetManifestResourceStream("Cms.Core.CodeTemplate.ModelTemplate.txt"))
{
if (stream != null)
{
using (StreamReader reader = new StreamReader(stream))
{
content = reader.ReadToEnd();
}
}
}
return content;

获取后stream为null，对应的资源属性需要以下设置