12.48 MS-WPFXV GridLengthSyntax

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[values]

auto

Indicates that automatic sizing should be used

*

Equivalent to a value of “1*”

[patterns]

[+-]?((\d[\d,]*(\.\d*)?)|((\d[\d,]*)?\.\d+))([eE][+-]?\d+)? (\s*(\*|PX|IN|CM|PT))?

A decimal floating point number, optionally followed by either ‘*’, ‘in’, ‘cm’, ‘pt’, or ‘px’