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I am using Qgis 1.7 and I want to refresh the mapcanvas so I am using refresh() function of QgsMapcanvas class and Nothing is happening to the Map Canvas. I am using Python for customizing

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I use 

self.iface.mapCanvas().refresh()

in Time Manager plugin and it works. You can check the source on Github.

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In QGis 2.16, with refresh() still nothing is happening. I use this command to refresh all layers:

self.iface.mapCanvas().refreshAllLayers()
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    To expand on this .refresh() "Repaints the canvas map" whereas .refreshAllLayers() will "Reload all layers, clear the cache and refresh the canvas" - from the docs
    – Jonny
    Commented Mar 21, 2019 at 18:34

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