{"record":{"id":"10b36b1ec316bfdb","repo":"MonoGame/MonoGame","slug":"the-data-array-is-too-small-10b36b","errorCode":null,"errorMessage":"The data array is too small.","messagePattern":"The data array is too small\\.","errorType":"validation","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"MonoGame.Framework/Graphics/Texture3D.cs","lineNumber":420,"sourceCode":"            var depth = back - front;\n\n            if (left < 0 || top < 0 || back < 0 || right > texWidth || bottom > texHeight || front > texDepth)\n                throw new ArgumentException(\"Area must remain inside texture bounds\");\n            // Disallow negative box size\n            if (left >= right || top >= bottom || front >= back)\n                throw new ArgumentException(\"Neither box size nor box position can be negative\");\n            if (level < 0 || level >= LevelCount)\n                throw new ArgumentException(\"level must be smaller than the number of levels in this texture.\");\n            if (data == null)\n                throw new ArgumentNullException(\"data\");\n            var tSize = ReflectionHelpers.FastSizeOf<T>();\n            var fSize = Format.GetSize();\n            if (tSize > fSize || fSize % tSize != 0)\n                throw new ArgumentException(\"Type T is of an invalid size for the format of this texture.\", \"T\");\n            if (startIndex < 0 || startIndex >= data.Length)\n                throw new ArgumentException(\"startIndex must be at least zero and smaller than data.Length.\", \"startIndex\");\n            if (data.Length < startIndex + elementCount)\n                throw new ArgumentException(\"The data array is too small.\");\n\n            var dataByteSize = width*height*depth*fSize;\n            if (elementCount * tSize != dataByteSize)\n                throw new ArgumentException(string.Format(\"elementCount is not the right size, \" +\n                                            \"elementCount * sizeof(T) is {0}, but data size is {1}.\",\n                                            elementCount * tSize, dataByteSize), \"elementCount\");\n        }\n\t}\n}\n\n","sourceCodeStart":402,"sourceCodeEnd":431,"githubUrl":"https://github.com/MonoGame/MonoGame/blob/1d71bbd0ff4071a03caa583aa3bc56b85924a819/MonoGame.Framework/Graphics/Texture3D.cs#L402-L431","documentation":"ArgumentException from Texture3D.ValidateParams when data.Length < startIndex + elementCount, i.e. the requested window runs past the end of the array. Guarantees the GPU copy stays within the managed buffer.","triggerScenarios":"Box-level SetData/GetData with elementCount larger than the remaining elements from startIndex, or a startIndex that pushes the window past the end.","commonSituations":"Volume buffer sized for one mip level but used on a larger one; partial fill with a wrong count; reusing a buffer with a stale elementCount.","solutions":["Size data to at least startIndex + elementCount before the call.","Recompute elementCount as data.Length - startIndex when copying the tail.","Match elementCount to the volume region's element requirement."],"exampleFix":"// before\nvar data = new float[128];\ntexture.SetData(0, 0,0,w, 0,h, 0,d, data, 0, 256);\n\n// after\nvar data = new float[256];\ntexture.SetData(0, 0,0,w, 0,h, 0,d, data, 0, 256);","handlingStrategy":"validation","validationCode":"int needed = startIndex + elementCount;\nif (data == null || data.Length < needed)\n    throw new InvalidOperationException($\"data needs {needed} elements, has {(data?.Length ?? 0)}\");\ntexture.SetData(level, l, t, r, b, f, bk, data, startIndex, elementCount);","typeGuard":null,"tryCatchPattern":"try\n{\n    texture.SetData(level, l, t, r, b, f, bk, data, start, count);\n}\ncatch (ArgumentException ex) when (ex.Message == \"The data array is too small.\")\n{\n    // resize data to needed size and retry\n}","preventionTips":["Size the buffer to startIndex + elementCount.","Account for the depth axis in volume buffers.","Recompute elementCount from the box volume."],"tags":["texture3d","setdata","getdata","buffer-size","argument-validation","monogame"],"backgroundTag":null,"analyzedSha":"1d71bbd0ff4071a03caa583aa3bc56b85924a819","analyzedAt":"2026-08-13T17:10:33.625Z","schemaVersion":2},"datasetVersion":"2026-08-13T19:17:28.613Z"}