The ornamental design for a trashcontainer, as shown and described.
FIG. 1 is a front, top, right side perspective view of an example of the trash container of the new design;
FIG. 2 is a front view thereof;
FIG. 3 is a left side view thereof, the right side being a mirror image;
FIG. 4 is a rear view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a front, top, right side perspective view of the example in an alternate position.
The broken lines showing structural elements in the drawings are included for the purpose of illustrating non-claimed subject matter, and form no part of the claimed design.